Aubrey, Benjamin, Mia and Rael share the same hobby of collecting stickers. The average number of stickers collected by the 4 friends is 29. Benjamin collected 7 more stickers than Mia but 18 fewer stickers than Aubrey. Rael collected 4 stickers fewer than Mia. Find the average number of stickers collected by Benjamin and Rael. Round off your answer to the nearest whole number.
Number of stickers Mia collected = 1 u
Number of stickers Benjamin collected = 1 u + 7
Number of stickers Aubrey collected = 1 u + 7 + 18 = 1 u + 25
Number of stickers Rael collected = 1 u - 4

Total number of stickers collected
= 4 x 29
= 116

Total number of stickers collected in units
= 1 u + 1 u + 7 + 1 u + 25 + 1 u - 4
= 4 u + 28

4 u + 28 = 116
4 u = 116 - 28 = 88

1 u = 88 ÷ 4 = 22

Total number of stickers collected by Benjamin and Rael
= 1 u + 7 + 1 u - 4
= 2 u + 3
= 2 x 22 + 3
= 47

Average number of stickers collected by Benjamin and Rael
= 47 ÷ 2
≈ 24 (Round off to the nearest whole number.)

Answer(s): 24