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20 April, 20:49

Brandon mows his lawn once every 5 days. Thomas mows his lawn every 3 days. If they are all mowing there lawn today, how many days will they be mowing there lawn together again?

A. 3

B. 5

C. 8

D. 15

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Answers (1)
  1. 20 April, 21:12
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    Answer: D. 15

    Step-by-step explanation:

    Given : Brandon mows his lawn once every 5 days.

    Thomas mows his lawn every 3 days.

    If they are all mowing there lawn today, then the number of days after which they will be mowing there lawn together again = LCM (5, 3)

    [LCM = Least common multiple]

    Since 5 and 3 are co primes (having no common factor other than 1),

    so LCM (5,3) = 5 x 3 = 15

    Therefore, they will be mowing there lawn together again after 15 days.

    Hence, the correct answer is D. 15.
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