125 gallon of a mixture contain 20% water. What amount of additional water should be added such that water content is raised to 25%?

At a symposium 20% of the professors are psychologist, 60% are biologist and the remaining 12 professors are e...

In a department 3/5 of the workers are men and the rest women. If 1/2 of the men and 3/7 of the women in the d...

The ratio of investments of two partners P and Q is 7: 5 and ratio of thier profits is 7: 10. If P invested th...

If w is 10% less than x, and y is 30% less than z, they wy is what percent less than xz?

If x is an integer and y=-2x-8, what is the least value of x which y is less than 9?

The next number in the sequence 3,6, 11, 18, 27 , ---