Rael, Evan, Harris and Alexander share the same hobby of collecting beads. The average number of beads collected by the 4 friends is 20. Evan collected 6 more beads than Harris but 17 fewer beads than Rael. Alexander collected 5 beads fewer than Harris. Find the average number of beads collected by Evan, Harris and Alexander. Round off your answer to the nearest whole number.
Number of beads Harris collected = 1 u
Number of beads Evan collected = 1 u + 6
Number of beads Rael collected = 1 u + 6 + 17 = 1 u + 23
Number of beads Alexander collected = 1 u - 5

Total number of beads collected
= 4 x 20
= 80

Total number of beads collected in units
= 1 u + 1 u + 6 + 1 u + 23 + 1 u - 5
= 4 u + 24

4 u + 24 = 80
4 u = 80 - 24 = 56

1 u = 56 ÷ 4 = 14

Total number of beads collected by Evan, Harris and Alexander
= 1 u + 6 + 1 u + 1 u - 5
= 3 u + 1
= 3 x 14 + 1
= 43

Average number of beads collected by Evan, Harris and Alexander
= 43 ÷ 3
≈ 14 (Round off to the nearest whole number.)

Answer(s): 14