Question

A can do a piece of work in 10 days, and B can do the same work in 20 days. With the help of C, they finished the work in 4 days. C can do the work in how many days, working alone? ​

Answer 1

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A can do a piece of work in 10 days, and B can do the same work in 20 days. With the help of C, they finished the work in 4 days. C can do the work in how many days, working alone? 

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$\small\tt{c\:alone\: will \:take \:}\\\\{\small\tt{\frac{1}{4}}-{\frac{1}{10}}-{\frac{1}{20}}}\: =\:{\frac {2}{20}}\rightarrow\:\:</p><p>{\frac{1}{10}}\\\\{\small\bf{It\: will\:take\:10 days \:to \:complete}}\\{\small\bf{the\: work}}$

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Answer 2

!! hlo dued your answer is 10 days !!