If x% of y is equal to z, What percent z is x ?

A sum of money at simple interest amounts to Tk. 815 in 3 tears and to Tk. 854 in 4 years.The sum is :

The simple interest on a sum of money at 8% per annum for 6 years is half the sum. The sum is :

36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?

4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8...

If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

If 3 men or 6 boys can do a piece of work in 10 days,working 7 hours a day; how many days will it take to comp...