Oliver, Harper, Ava and Owen share the same hobby of collecting beads. The average number of beads collected by the 4 friends is 24. Harper collected 6 more beads than Ava but 13 fewer beads than Oliver. Owen collected 5 beads fewer than Ava. Find the average number of beads collected by Harper and Owen. Round off your answer to the nearest whole number.
Number of beads Ava collected = 1 u
Number of beads Harper collected = 1 u + 6
Number of beads Oliver collected = 1 u + 6 + 13 = 1 u + 19
Number of beads Owen collected = 1 u - 5

Total number of beads collected
= 4 x 24
= 96

Total number of beads collected in units
= 1 u + 1 u + 6 + 1 u + 19 + 1 u - 5
= 4 u + 20

4 u + 20 = 96
4 u = 96 - 20 = 76

1 u = 76 ÷ 4 = 19

Total number of beads collected by Harper and Owen
= 1 u + 6 + 1 u - 5
= 2 u + 1
= 2 x 19 + 1
= 39

Average number of beads collected by Harper and Owen
= 39 ÷ 2
≈ 20 (Round off to the nearest whole number.)

Answer(s): 20