The mean of p, q, r, s and t is 280. If the mean of p, r and t is 240, what is the mean of q and s?

If the average of m numbers is n*n and that of n numbers is m*m , then the average of m+n numbers is

The average monthly income of P and Q is ₹ 5,050. The average monthly income of Q and R is ₹ 6,250 and the average monthly income of P and R is ₹ 5,200. The monthly income of P is

If M is the mean of the first 100 even natural numbers, then what is the mean of the first 100 odd natural numbers?

Let five odd consecutive natural numbers be P, Q, R, S and T. What is their average?

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