solve this
Village A has a population of 70,000, which is decreasing at the rate of 1000 per year.
Village B has a population of 52000, which is increasing at the rate of 400 half yearly
.How many years will they take to reach same population
try its easy .............
leave your answer as a comment......
ANSWER
let,after x yrs their will b same...
after x yrs in A population decreases 1000x & in B population increases (2*400*x)=800x .
So,
70000-1000x = 52000 + 800x
x= 10
Showing posts with label MATHS. Show all posts
Showing posts with label MATHS. Show all posts
Temperature Conversion
Temperature Conversion
This is a easy trick to convert Fahrenheit to Celsius & vice versa.
The answer you will get will not be an exact one, but it will give you an idea of the temperature you are looking at.
Fahrenheit to Celsius:
Take 30 away from the Fahrenheit, then divide the answer by 2. This is your answer in Celsius.
Example:
94 Fahrenheit - 30 = 64. Then divide by two, 32 Celsius.
so 94 Fahrenheit = 32 Celsius.
Celsius to Fahrenheit just do the reverse:
Double it, then add 30.
40 Celsius double it, is 80, then add 30 is 110
40 Celsius = 110 Fahrenheit
This is a easy trick to convert Fahrenheit to Celsius & vice versa.
The answer you will get will not be an exact one, but it will give you an idea of the temperature you are looking at.
Fahrenheit to Celsius:
Take 30 away from the Fahrenheit, then divide the answer by 2. This is your answer in Celsius.
Example:
94 Fahrenheit - 30 = 64. Then divide by two, 32 Celsius.
so 94 Fahrenheit = 32 Celsius.
Celsius to Fahrenheit just do the reverse:
Double it, then add 30.
40 Celsius double it, is 80, then add 30 is 110
40 Celsius = 110 Fahrenheit
FUNNY CALCULATOR TRICK
1. take a calculator
2. type in "12345679" (remember not 8)
3. times it by any number multiplied by 9,
lets say if u you want 5as answer , 5*9=45, so 12345679*45=?
try multiplying by: 9,18,27,36 and so on...
& see the magic of maths
2. type in "12345679" (remember not 8)
3. times it by any number multiplied by 9,
lets say if u you want 5as answer , 5*9=45, so 12345679*45=?
try multiplying by: 9,18,27,36 and so on...
& see the magic of maths
TO FIND SQUARE OF 3-DIGIT NUMBER
LET THE NUMBER BE ABC
SQ (ABC) is calculated like this
STEP 1. Last digit = last digit of SQ(C)
STEP 2. Second Last Digit = 2*B*C + any carryover from STEP 1.
STEP 3. Third Last Digit 2*A*C+ Sq(B) + any carryover from STEP
2.
STEP 4. Fourth last digit is 2*A*B + any carryover from STEP 3.
STEP 5 . In the beginning of result will be Sq(A) + any carryover
from Step 4.
EXAMPLE :
SQ (431)
STEP 1. Last digit = last digit of SQ(1) =1
STEP 2. Second Last Digit = 2*3*1 + any carryover from STEP
1.= 6
STEP 3. Third Last Digit 2*4*1+ Sq(3) + any carryover from STEP
2.= 2*4*1 +9= 17. so 7 and 1 carryover
STEP 4. Fourth last digit is 2*4*3 + any carryover (which is 1) . =
24+1=25. So 5 and carry over 2.
STEP 5 . In the beginning of result will be Sq(4) + any carryover
from Step 4. So 16+2 =18.
So the result will be 185761.
SQ (ABC) is calculated like this
STEP 1. Last digit = last digit of SQ(C)
STEP 2. Second Last Digit = 2*B*C + any carryover from STEP 1.
STEP 3. Third Last Digit 2*A*C+ Sq(B) + any carryover from STEP
2.
STEP 4. Fourth last digit is 2*A*B + any carryover from STEP 3.
STEP 5 . In the beginning of result will be Sq(A) + any carryover
from Step 4.
EXAMPLE :
SQ (431)
STEP 1. Last digit = last digit of SQ(1) =1
STEP 2. Second Last Digit = 2*3*1 + any carryover from STEP
1.= 6
STEP 3. Third Last Digit 2*4*1+ Sq(3) + any carryover from STEP
2.= 2*4*1 +9= 17. so 7 and 1 carryover
STEP 4. Fourth last digit is 2*4*3 + any carryover (which is 1) . =
24+1=25. So 5 and carry over 2.
STEP 5 . In the beginning of result will be Sq(4) + any carryover
from Step 4. So 16+2 =18.
So the result will be 185761.
METHOD OF MULTIPLICATION
i will show u one more method of multiplication.
IT IS VERY EASY
EG:
96*96
take hundred as the reference.then think what should be subtracted from 96 to make it hundred.
-4.
then write like this
96 96
-4 -4
add diagonally 96-4=92
multiply -4*-4=16
the product of 96*96 will be 9216
IF U LIKE THIS TRICK PLZ LEAVE UR COMMENTS
IT IS VERY EASY
EG:
96*96
take hundred as the reference.then think what should be subtracted from 96 to make it hundred.
-4.
then write like this
96 96
-4 -4
add diagonally 96-4=92
multiply -4*-4=16
the product of 96*96 will be 9216
IF U LIKE THIS TRICK PLZ LEAVE UR COMMENTS
INCREASE UR SPEED OF MULTIPLICATION
take a number ending with 5 and then multiply it by itself
a simple method
eg:35*35
multiply the first digit ie 3 with the (digit+1)=4
3*4=12
these r the first two nos of ans
the last two nos will always be 25
so the ans is 1225
a simple method
eg:35*35
multiply the first digit ie 3 with the (digit+1)=4
3*4=12
these r the first two nos of ans
the last two nos will always be 25
so the ans is 1225
SOLVE THIS......
solve this ...
4___4___4___4=20
rules
>USe any three symbols two solve it
>u can use Multiply*, Subtract-, Add+ or divide/.........dnt use symbols twice
one solution to this problem is
[ ( 4 / 4) + 4 ] * 4
T
if u have any other u can write in comment with ur name
4___4___4___4=20
rules
>USe any three symbols two solve it
>u can use Multiply*, Subtract-, Add+ or divide/.........dnt use symbols twice
one solution to this problem is
[ ( 4 / 4) + 4 ] * 4
T
if u have any other u can write in comment with ur name
TRICK TO WRITE TABLE OF 13 EASILY
like 13 tables s written by writing tables of 1 and 3 seperately next to each other..
1 3
2 6
3 9
4 12 = 1 is carried to 4 = becomes 5 2
5 15 = 1 carried to 5 = 6 5
similarly
6 18 = 76
7 21 = 91
8 24 = 104
9 27 = 117
10 30 = 130
similarly it can be done for any number tables.
1 3
2 6
3 9
4 12 = 1 is carried to 4 = becomes 5 2
5 15 = 1 carried to 5 = 6 5
similarly
6 18 = 76
7 21 = 91
8 24 = 104
9 27 = 117
10 30 = 130
similarly it can be done for any number tables.
TRICK TO WRITE TABLE OF 13 EASILY
like 13 tables s written by writing tables of 1 and 3 seperately next to each other..
1 3
2 6
3 9
4 12 = 1 is carried to 4 = becomes 5 2
5 15 = 1 carried to 5 = 6 5
similarly
6 18 = 76
7 21 = 91
8 24 = 104
9 27 = 117
10 30 = 130
similarly it can be done for any number tables.
1 3
2 6
3 9
4 12 = 1 is carried to 4 = becomes 5 2
5 15 = 1 carried to 5 = 6 5
similarly
6 18 = 76
7 21 = 91
8 24 = 104
9 27 = 117
10 30 = 130
similarly it can be done for any number tables.
Convert 1 to 9 = 100
Convert 1 to 9 = 100
Convert the numbers 1 to 9 which will results to "100", by inserting any of arithmetic operations (+ - * /) into the string of above numbers.
And one more interesting thing is by keeping the numbers in the above order i.e. 123456789..
there are many solutions to above problem. if u have any plz write in the comment ......
One is: 1+2+3-4+5+6+78+9
others are
123+45-67+8-9=100
12+3+4-56/7+89=100
1+2+3+4+5+6+7+8*9=100
-1 + (2*3*4) + (5*6)+(7*8) - 9 =100
1*2+3+45+67-8-9=100
(1+2+3+4)*5+67-(8+9)=100
if u have any plz write in the comment ....
Convert the numbers 1 to 9 which will results to "100", by inserting any of arithmetic operations (+ - * /) into the string of above numbers.
And one more interesting thing is by keeping the numbers in the above order i.e. 123456789..
there are many solutions to above problem. if u have any plz write in the comment ......
One is: 1+2+3-4+5+6+78+9
others are
123+45-67+8-9=100
12+3+4-56/7+89=100
1+2+3+4+5+6+7+8*9=100
-1 + (2*3*4) + (5*6)+(7*8) - 9 =100
1*2+3+45+67-8-9=100
(1+2+3+4)*5+67-(8+9)=100
if u have any plz write in the comment ....
Simple trick to remember table of 19
Simple trick to remember table of 19
The first digit is increamenting by 2 and second is decrementing by 1
19 * 01 = 019
19 * 02 = 038
19 * 03 = 057
19 * 04 = 076
19 * 05 = 095
19 * 06 = 114
19 * 07 = 133
19 * 08 = 152
19 * 09 = 171
19 * 10 = 190
The first digit is increamenting by 2 and second is decrementing by 1
19 * 01 = 019
19 * 02 = 038
19 * 03 = 057
19 * 04 = 076
19 * 05 = 095
19 * 06 = 114
19 * 07 = 133
19 * 08 = 152
19 * 09 = 171
19 * 10 = 190
trick to remember table of 29
for 29 units digit decreases by 1 and tens digit increases by 3.
29 * 1 = 029
29 * 2 = 058
29 * 3 = 087
29 * 4 = 116
29 * 5 = 145
29 * 6 = 174
29 * 7 = 203
29 * 8 = 232
29 * 9 = 261
29 *10 = 290
29 * 1 = 029
29 * 2 = 058
29 * 3 = 087
29 * 4 = 116
29 * 5 = 145
29 * 6 = 174
29 * 7 = 203
29 * 8 = 232
29 * 9 = 261
29 *10 = 290
find square of a number between 50 and 60
find square of a number between 50 and 60
for example......
56^2=3136
57^2=3249
58^2=3364
there is a 2 steps trick to get the ans
1) add the digit at the units place to 25 and write the sum
2) then calculate the square of units place digit and write it
eg in case of 56^2
we have 25+6=31
and square of 6 is 36
hence the result is 3136
for example......
56^2=3136
57^2=3249
58^2=3364
there is a 2 steps trick to get the ans
1) add the digit at the units place to 25 and write the sum
2) then calculate the square of units place digit and write it
eg in case of 56^2
we have 25+6=31
and square of 6 is 36
hence the result is 3136
MAGIC OF MATHS
111/1+1+1 = 37
222/2+2+2 = 37
333/3+3+3 = 37
444/4+4+4 = 37
555/5+5+5=37
666/6+6+6=37
777/7+7+7=37
888/8+8+8=37
999/9+9+9=37
222/2+2+2 = 37
333/3+3+3 = 37
444/4+4+4 = 37
555/5+5+5=37
666/6+6+6=37
777/7+7+7=37
888/8+8+8=37
999/9+9+9=37
