Maths / Direct and Inverse Variation / Time and Work

QUESTION
 

A and B can finish a work in 20 days. A alone can do  large frac{1}{5} th of the work in 12 days. How many days can B alone do it?

EXPLANATION
Explain TypeExplanation Content
Text

30 days

A and B one day work = large frac{1}{20}

Work of A in 12 day = large frac{1}{5}

Work of A in One day = large frac{1}{5times 12}=frac{1}{60}

Work of B Alone = Work of A + B - Work of A alone

large frac{1}{20}-frac{1}{60}=frac{2}{60}=frac{1}{30}

B alone will take 30 days to complete.

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