Question

A and B do a work in 12 days. B and C in 15 days and C and A in 20 days. In what time they can finish the work all together (in days): (a) 10 (b) 5 (c) 15 (d) 25​

Answer 1

Answer:

Option A ( 10 ) is the correct.

Step-by-step explanation:

A+ B = 1/12 ( in 1 day )

B+ C = 1/15 ( in 1 day )

C+A = 1/20 ( in 1 day )

If they do work together, then = 2 ( A +B+ C )= 1/12 +1/15 + 1/20

2( A+B+C) = 12/60

A+ B+ C = 1/5 ×2

A+B+C = 1/10 ( work in a single day )

Hence, they can finish the work all together in 10 days .

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