Question

Five consecutive multiples of 3 add up to 105. What is the second smallest number

89 points!

Answer 1

18

Explanation:

Answer 2

18

Explanation:

Let's call the first number n. The next four numbers will be n + 3, n + 6, n + 9 and n + 12. Then, we have

n + n + 3 + n + 6 + n + 9 + n + 12 = 105

5n + 30 = 105

5n = 75

n = 15

The second smallest number is n + 3 which is 15 + 3 = 18.