The mean of four consecutive even numbers is 15.the greatest of these numbers is a1.the least of these numbers is a2.

Let x be the first even number. Then adding 2 consecutively gives us the subsequent even numbers. That is

From the question, the mean of these four numbers is 15. That is;

Multiply both sides by 4 to obtain,

Divide both sides by 4 to obtain,

8121 because

130,000 divided by 16 is 8121