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?

The radius of a circular garden is 7 metres more than the length of a rectangle whose perimeter is 364 metres and breadth is 84 metres. What will be cost of fencing the garden (only at the circumference), if the cost of fencing is Rs.8 per metre?