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iHeartYou

  • 2 years ago

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

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  1. kumar2006
    • 2 years ago
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    would take 30 minutes

  2. kumar2006
    • 2 years ago
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    c

  3. saifoo.khan
    • 2 years ago
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    How'd you got it?

  4. saifoo.khan
    • 2 years ago
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    1/15 + 1/x = 1/10

  5. ryman
    • 2 years ago
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    1/15 + 1/x = 1/10

  6. Mertsj
    • 2 years ago
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    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
    • 2 years ago
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    can you solve that iheart?

  8. iHeartYou
    • 2 years ago
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    no sir i can not

  9. Mertsj
    • 2 years ago
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    Multiply each term by the common denominator which is 30x

  10. ryman
    • 2 years ago
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    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
    • 2 years ago
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    thank very kind

  12. iHeartYou
    • 2 years ago
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    :)

  13. ryman
    • 2 years ago
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    yw

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