## iHeartYou Group Title 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 2 years ago 2 years ago

1. kumar2006 Group Title

would take 30 minutes

2. kumar2006 Group Title

c

3. saifoo.khan Group Title

How'd you got it?

4. saifoo.khan Group Title

1/15 + 1/x = 1/10

5. ryman Group Title

1/15 + 1/x = 1/10

6. Mertsj Group Title

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 $\frac{1}{15}+\frac{1}{x}=\frac{1}{10}$

7. ryman Group Title

can you solve that iheart?

8. iHeartYou Group Title

no sir i can not

9. Mertsj Group Title

Multiply each term by the common denominator which is 30x

10. ryman Group Title

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

11. iHeartYou Group Title

thank very kind

12. iHeartYou Group Title

:)

13. ryman Group Title

yw