A can do a piece of work in 15 days and B can do it in 10 days. Working together how long will they take to finish the work?

A 4 days
B 5 days
C 6 days
D 7 days

Correct Answer: 6 days

In 15 days A can do 1 portion in 1 days A can do 1/15 portion In 10 days B can do 1 portion In 1 days B can do 1/10 portion In 1 day A & B can do ( 1/15 + 1/10) or 2 + 3/30 or 5/30 or 1/6 portion A & B can finish 1/6 portion in 1 day A & B can finish 1 portion in 1/6 day = 6 days
Bissoy MCQ
#গণিত #Social Islami Bank Ltd #Social Islami Bank Ltd - Trainee Officer - 31.12.2010

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