The average of four consecutive odd numbers P, Q, R and S respectively (in increasing order) is 104. What is the sum of P and S?

Find the average of the following set of scores:142, 93, 102, 206, 115, 98.

A and B together can complete a piece of work in 16 days. B alone can complete the same work in 24 days. In how many days can A alone complete the same work?

A car manufacturing plant manufactures 96 dozen cars in eight days. How many dozen cars will the plant manufacture in 17 days?

The average age of a man and his son is 28 years. The ratio of their ages is 3 : 1. What is the man's age?

If 43x + 43y = 4816, what is the average of x and y?