Question

It takes Tom 15 minutes to wash a car.It takes only 10 minutes with jerry helping.how long should it take jerry to wash the car by himself?

A. 6 minutes
b. 12.5 minutes
c. none of these choices are correct.
d. 25 minutes
e. 5 minutes

Answer 1

would take 30 minutes

Answer 2

c

Answer 3

How'd you got it?

Answer 4

1/15 + 1/x = 1/10

Answer 5

1/15 + 1/x = 1/10

Answer 6

Tom can wash 1/15 of the car in 1 minute
Together they wash 1/10 of the car in 1 minutes.
The part Tom does + the part Jerry does = the part they do together. So
\[\frac{1}{15}+\frac{1}{x}=\frac{1}{10}\]

Answer 7

can you solve that iheart?

Answer 8

no sir i can not

Answer 9

Multiply each term by the common denominator which is 30x

Answer 10

ok - first find LCM of 10,15 and x
this is 30x
multiply each term by 30x gives
30x 30x 30x
---- + --- = ---
15 x 10

dividing each term

2x + 30 = 3x
30 = 3x - 2x = x

so x = 30

none of the choices are correct - as kumar said the answer is c

Answer 11

thank very kind

Answer 12

:)

Answer 13

yw