Kaylee, Harris, Robert and Rael share the same hobby of collecting beads. The average number of beads collected by the 4 friends is 23. Harris collected 6 more beads than Robert but 13 fewer beads than Kaylee. Rael collected 5 beads fewer than Robert. Find the average number of beads collected by Harris, Robert and Rael. Round off your answer to the nearest whole number.
Number of beads Robert collected = 1 u
Number of beads Harris collected = 1 u + 6
Number of beads Kaylee collected = 1 u + 6 + 13 = 1 u + 19
Number of beads Rael collected = 1 u - 5

Total number of beads collected
= 4 x 23
= 92

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

4 u + 20 = 92
4 u = 92 - 20 = 72

1 u = 72 ÷ 4 = 18

Total number of beads collected by Harris, Robert and Rael
= 1 u + 6 + 1 u + 1 u - 5
= 3 u + 1
= 3 x 18 + 1
= 55

Average number of beads collected by Harris, Robert and Rael
= 55 ÷ 3
≈ 18 (Round off to the nearest whole number.)

Answer(s): 18