Girl and Boy together can complete a piece of work in 35 days while Girl alone can complete the same work in 60 days. Boy alone will be able to complete the same working in:	Choose the correct answer:
A) 72
B) 75
C) 84
D) 88
E) 90

Rationale: subtraction of fraction ab − cd = ad − cbbd girl and boy finish one work with company = 35 days ( girl + boy ) ′ s one day ’ s work = 135 girl alone finish the same work = 60 days girl ′ s one day ’ s work = 160 b ′ s one day ’ s work = ( a + b ) ′ s one day ’ s work - a ′ s one day ’ s work 135 − 160 = 184 hence b alone can complete the work in 84 days
Answer: B