Jamie, Josiah, Maya and Jeremiah share the same hobby of collecting beads. The average number of beads collected by the 4 friends is 21. Josiah collected 7 more beads than Maya but 13 fewer beads than Jamie. Jeremiah collected 3 beads fewer than Maya. Find the average number of beads collected by Josiah, Maya and Jeremiah. Round off your answer to the nearest whole number.
Number of beads Maya collected = 1 u
Number of beads Josiah collected = 1 u + 7
Number of beads Jamie collected = 1 u + 7 + 13 = 1 u + 20
Number of beads Jeremiah collected = 1 u - 3

Total number of beads collected
= 4 x 21
= 84

Total number of beads collected in units
= 1 u + 1 u + 7 + 1 u + 20 + 1 u - 3
= 4 u + 24

4 u + 24 = 84
4 u = 84 - 24 = 60

1 u = 60 ÷ 4 = 15

Total number of beads collected by Josiah, Maya and Jeremiah
= 1 u + 7 + 1 u + 1 u - 3
= 3 u + 4
= 3 x 15 + 4
= 49

Average number of beads collected by Josiah, Maya and Jeremiah
= 49 ÷ 3
≈ 16 (Round off to the nearest whole number.)

Answer(s): 16