What is the average of the first four multiples of 6?

25 14 20 15

15

The first four multiples of 6 = 6, 12, 18, 24 Average of these numbers = $\frac{sum \;of \;numbers}{4}$                                       = $\frac{6+12+18+24}{4}$ = $\frac{60}{4}$ = 15