In an examination 75% of the students passed in mathematics, 45% passed in general science and 30% passed in both subject. What per cent of the students have failed in both subject?

By what per cent the use of fuel is to be reduced in order to keep expenditure on it at same level when its pr...

The length and breadth of a rectangle are 24 meters and 12 meter respectively. By what percent the area of the...

What amount of money (in TK) wil grow to Tk. 2380 in eight years if the simple rate of interest applied is 5%...

What would be the ratio of x and y if 5x+9y=61 and 7x+3y=47?

The length of a rectangle is three times its breadth. Waht is the perimeter of the rectangle (in meters) if it...

If a deposit of Tk.750 earns simple interest @ 8% per annum and that of Tk. 1250 earns the same @6% per annum,...