In an enclosure there are crows and cows. If there are 30 heads and 100 legs, what is the ratio of cows to crows?

If sides of a triangle are in the ratio 1:√3:2, what is the ratio of corresponding angles?

The arithmetic mean of 100 observations is 50. If 10 is added to each observation then what will be the new arithmetic mean?

A zoo has some lions and parrots. The keeper counted 15 heads and 50 legs. Number of lions is

If p is the difference between a number and its reciprocal and q is the difference between the square of the same number and the square of its reciprocal, then what is p⁴ + 4p² equal to ?

Let P = N² where N is an odd integer. What is the remainder when P is divided by 8?