Question

a and b together can finish a piece of woekin 12 days if a alonr can finisj the samework in, 20 days in jow many days b can alone finidh it ?
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Answer 1

here is ur ans ❤

Q.. A and B together can finish a piece of work in 12 days. If A alone can finish the same work in 20 days, then in how many days will it take B to finish alone?

ANS.

• A can do a work in = 20 days

• Let B can do the work in =X days

• Both A and B can do the work in = 1/12 days

• Therefore 1/20 + 1/X= 1/12

• So 12 (X+20) = 20 X;

• So 8X= 240 ; X= 30.

• Therefore “B” can do the work alone in 30 - days.

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Another Simple Method:

• In 12- days A- can complete= 12/20= 3/5- part of the work.

• So in 12- days B- can complete (1–3/5) = 2/5- part of the work.

• So complete work can be done by B- alone in 12÷ (2/5)= 12 x5/2= 30- days.

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hope it helps you