It costs Tk. 1000 to make the first thousand copies of a book and x taka to make each additional copies. If a total of 6000 copies were made with a total cost of Tk. 5500, what is X?

If x is 2/5 of y and y is 5/7 of z, what is the ratio of z : x?

If 3 tailors can make 60 shirts per day, how many days will it take 6 tailors to make 120 shirts?

A trader purchased some pens for Tk. 150. If the price of each pen was Tk. 5 less, he would have got 5 more pe...

If a man was r years old s years ago, how many years old will he be t years from now?

If A : B= 1 : 2, B : C = 4 : 3 and A + B + C = 450, what is the value of B?

The length of a rectangle is increased by 50%. By what percent would the width have to be decreased to maintai...