Farida can paint a school boundary wall in 18 days and Gopal in 27 days. They paint together for 4 days and then Farida is moved to another site. How many more days will Gopal need to finish the wall alone?

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Accepted Answer

17. In 4 days they finish 4 × (1/18 + 1/27) = 4 × 5/54 = 10/27 of the wall. Gopal finishes the remaining 17/27 at 1/27 per day in 17 days.

Farida can paint a school boundary wall in 18 days and Gopal in 27 days. They paint together for 4 days and then Farida is moved to another site. How many more days will Gopal need to finish the wall alone?

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