Question
Together, Ali and Imran take 40 days to complete a project.
After working jointly for 32 days, they left, and Zara completed the remaining work in 4 days. How much time would Zara take to complete 70% of the work on her own?Solution
ATQ,
Fraction of work done by Ali and Imran = 32 / 40 = 4/5
Fraction of work done by Zara = 1 - 4/5 = 1/5
So, number of days taken by Zara alone to complete the entire work = 4 ÷ (1/5) = 20 days
So, time taken by Zara to complete 70% of the work = 20 × 0.70 = 14 days
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