The average number of stickers that Bryan and Charlie have is 32.
The average number of stickers that Bryan and Adam have is 57.
The number of stickers that Charlie has is
38 as many as Adam.
- How many stickers does Bryan have?
- How many stickers does Charlie have?
- How many stickers does Adam have?
(a)
Number of stickers that Bryan and Charlie has
= 2 x 32
= 64
Number of stickers that Bryan and Adam has
= 2 x 57
= 114
Number of stickers that Charlie has = 3 u
Number of stickers that Adam has = 8 u
Let the number of Bryan's stickers be B.
Let the number of Charlie's stickers be C.
Let the number of Adam's stickers be A.
B + C = 64
B + 3 u = 64 --- (1)
B + A = 114
B + 8 u = 114 --- (2)
(2) - (1)
(B + 8 u) - (B + 3 u ) = 114 - 64
B + 8 u - B - 3 u = 50
B - B + 8 u - 3 u = 50
5 u = 50
1 u = 50 ÷ 5 = 10
Substitute 1 u = 10 into (1).
B + 3 x 10 = 64
B + 30 = 64
B = 64 - 30 = 34
Number of stickers that Bryan has = 34
(b)
Number of stickers that Charlie has
= 3 u
= 3 x 10
= 30
(c)
Number of stickers that Adam has
= 8 u
= 8 x 10
= 80
Answer(s): (a) 34; (b) 30; (c) 80