Two variables y and x are related as y = 5x + 4. The arithmetic mean of x is 10. Arithmetic mean of y will be

The sum of two numbers is 15 and their geometric mean is 20% lower than their arithmetic mean. Then the numbers will be:

The arithmetic mean of the series 1, 2, 4, 8, 16, ... 2ⁿ is

The arithmetic mean of the numbers 9, 12, 15, 18, 20, 22 is increased by 1, if 15 is replaced by

If mean of P, Q, R, S, T is 100 and mean of Q, R, S, T, U is 120 and P + U = 100, what is the mean of P, Q, R, S, T and U?

If harmonic mean of three numbers is 3 and two numbers are 2 and 6, what is third number?