Question

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Answer 1

Answer:

b) 7 1/2 days ( seven and a half days)

Step-by-step explanation:

in this question we mainly use unitary method to get to the answer.

A:

amount of work done by A in 15 days = 1 ( according to question)

amount of work done by A in 1 day = 1/15 ( using unitary method)

B:

amount of work done by B in 10 days = 1 ( according to question)

amount of work done by B in 1 day = 1/10 (using unitary method)

amount of work done by B in 5 days = 1/10 * 5 = 5/10 = 1/2

therefore amount of work left = 1/2

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no. of days required by A to finish 1/2 work ,alone =  1/2 divided by 1/15 = 1/2*15 = 7.5 = seven and a half days