Morad and Elias are car mechanics. morad can complete a certain task in x hours. Elias can complete the same task in y hours. which equation correctly describes their combined hourly rate of work? A) x+y=x+y B) 1/x + 1/y = 1/xy C) 1/x + 1/y = x+y/xy D) 1/x + 1/y = 1/x+y

Question

Mathematics

Amy Hobbs

15 June, 20:08

Morad and Elias are car mechanics. morad can complete a certain task in x hours. Elias can complete the same task in y hours. which equation correctly describes their combined hourly rate of work? A) x+y=x+y B) 1/x + 1/y = 1/xy C) 1/x + 1/y = x+y/xy D) 1/x + 1/y = 1/x+y

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Answers (1)

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Martha · Answer 1

C) 1/x + 1/y = x+y/x. y is the right answer. Why?

1 - Morad will complete his task It's C) 1 / x + 1/y = x+y/xy. Why?

Morad complted his task in in "x" hours. and

in 1 hour he will complete 1/x of the task

2 - Elias completed his task in in "y" hours. and

in 1 hour he will complete 1/y of the task:

3 - 1/x + 1/y = (x+y) / xy (reduce to same denominator)