GMAT Exam

If 2 men and 5 women do apiece of work in 8 days and 2 men and 7 children do the same piece of work in 12 days. show that 10 women can do as much work in 9 days as 31 children

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GMAT Other Question

a father is twice as old his son. 8 years ago their ages were in the ratio 8:3. find their present ages? What is the greatest value of a positive integer n such that 3n is a factor of 1815?