In a university, 80 percent of the students lived in hostel, and 60 percent of the hostel students are lucky to get a single room. If number of lucky students is 1200, then how many students were there in the university?

X sells a product to Y and makes a profit of 25%. Y sells it to Z at a loss of 20%. If Z buys it for Tk. 140,...

On selling an article for Tk. 550, a man gains 10%. What will be the selling price, if desired profit is 20%?

A can do a piece of work in 15 days and B can do it in 10 days. Working together how long will they take to fi...

If the length of a rectangle is 8 cm and its diagonal is 10 cm, find its area.

A man loses Tk. 55.50 yearly when the annual rate of interest falls from 11.5% to 10% his capital is:

The population of a certain town increases by 50 percent every 50 years. If the population in 1950 was 810 , i...