3 children have a total of 800 stickers.
Charlie has 3 times as many stickers as Bryan.
Adam has 400 stickers more stickers than Bryan.
- How many stickers do Charlie and Bryan have?
- How many stickers does Bryan have less than Charlie?
- How many stickers does Bryan have less than Charlie and Adam?
(a)
Choose the person with least stickers to be 1 u.
Number of stickers that Bryan has = 1 u
Number of stickers that Charlie has = 3 u = 3 u
Number of stickers that Adam has = 1 u + 400
Total number of stickers
= 1 u + 3 u + 1 u + 400
= 5 u + 400
5 u + 400 = 800
5 u = 800 - 400
5 u = 400
1 u = 400 ÷ 5 = 80
Number of stickers that Charlie and Bryan have
= 3 u + 1 u
= 4 u
= 4 x 80
= 320
(b)
Number of stickers that Bryan has less than Charlie
= 3 u - 1u
= 2 u
= 2 x 80
= 160
(c)
Number of stickers that Bryan has less than Charlie and Adam
= (3 u + 1 u + 400) - 1 u
= 3 u + 400
= 3 x 80 + 400
= 240 + 400
= 640
Answer(s); (a) 320; (b) 160; (c) 640