Stella, Rael, Jacob and Aria share the same hobby of collecting stickers. The average number of stickers collected by the 4 friends is 27. Rael collected 8 more stickers than Jacob but 17 fewer stickers than Stella. Aria collected 5 stickers fewer than Jacob. Find the average number of stickers collected by Rael and Aria. Round off your answer to the nearest whole number.
Number of stickers Jacob collected = 1 u
Number of stickers Rael collected = 1 u + 8
Number of stickers Stella collected = 1 u + 8 + 17 = 1 u + 25
Number of stickers Aria collected = 1 u - 5

Total number of stickers collected
= 4 x 27
= 108

Total number of stickers collected in units
= 1 u + 1 u + 8 + 1 u + 25 + 1 u - 5
= 4 u + 28

4 u + 28 = 108
4 u = 108 - 28 = 80

1 u = 80 ÷ 4 = 20

Total number of stickers collected by Rael and Aria
= 1 u + 8 + 1 u - 5
= 2 u + 3
= 2 x 20 + 3
= 43

Average number of stickers collected by Rael and Aria
= 43 ÷ 2
≈ 22 (Round off to the nearest whole number.)

Answer(s): 22