please answer it quickly I will promote it brainiest
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please answer it quickly I will promote it brainiest
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Option(B) - 84 days.
Explanation:
Given that (A + B) can complete a work a work in 35 days.
Therefore (A + B)'s 1 - day work = 1/35.
Given that A alone can complete the work in 60 days.
Therefore A's alone 1 - day work = 1/60.
Hence B's alone 1 - day work = 1/35 - 1/60
= 12 - 7/420
= 1/84.
Therefore B alone can complete the work in 84 days.
Hope this helps!
Verified answer
(A + B)’s one day work = 1/35A’s one day work = 1/60
B’s one day’s work = (A + B)’s one days work - A’s one day’s work
1/35 - 1/60 = 1/84
So 84 days is the correct answer.