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The National Girl Child Day is celebrated in India every year on January 24. The Ministry of Women and Child Development, Government of India initiated this celebration in 2008.
A and B together can complete a piece of work in 10 days. A alone can complete the work in 15 days. How many days will B take to complete the work alone?
A isfive times as efficient as B and can finish a piece of work in 36 days less than B. B can finish this work in how many days?