Evan, Wyatt, Michael and Harris share the same hobby of collecting marbles. The average number of marbles collected by the 4 friends is 22. Wyatt collected 9 more marbles than Michael but 15 fewer marbles than Evan. Harris collected 5 marbles fewer than Michael. Find the average number of marbles collected by Wyatt, Michael and Harris. Round off your answer to the nearest whole number.
Number of marbles Michael collected = 1 u
Number of marbles Wyatt collected = 1 u + 9
Number of marbles Evan collected = 1 u + 9 + 15 = 1 u + 24
Number of marbles Harris collected = 1 u - 5

Total number of marbles collected
= 4 x 22
= 88

Total number of marbles collected in units
= 1 u + 1 u + 9 + 1 u + 24 + 1 u - 5
= 4 u + 28

4 u + 28 = 88
4 u = 88 - 28 = 60

1 u = 60 ÷ 4 = 15

Total number of marbles collected by Wyatt, Michael and Harris
= 1 u + 9 + 1 u + 1 u - 5
= 3 u + 4
= 3 x 15 + 4
= 49

Average number of marbles collected by Wyatt, Michael and Harris
= 49 ÷ 3
≈ 16 (Round off to the nearest whole number.)

Answer(s): 16