Question

Anne, Bella and Cindy can do a piece of work in 20, 30 and 60 days respectively. Anne can do work in 15 days and Bella in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:​

Answer 1

After working together for 4 days, it would remain 3/5 of the work.

Equation

Equation is an expression used to show the relationship between two or more variables and numbers.

Let a represent the remaining work after 4 days, hence, in four days:

(1/20 + 1/30 + 1/60) * 4 days + a = 1

0.4 + a = 1

a = 0.6 = 3/5

Therefore After working together for 4 days, it would remain 3/5 of the work.

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