3 children have a total of 1600 stickers.
Adam has 2 times as many stickers as Bryan.
Charlie has 800 stickers more stickers than Bryan.
- How many stickers do Adam and Bryan have?
- How many stickers does Bryan have less than Adam?
- How many stickers does Bryan have less than Adam and Charlie?
(a)
Choose the person with least stickers to be 1 u.
Number of stickers that Bryan has = 1 u
Number of stickers that Adam has = 2 u = 2 u
Number of stickers that Charlie has = 1 u + 800
Total number of stickers
= 1 u + 2 u + 1 u + 800
= 4 u + 800
4 u + 800 = 1600
4 u = 1600 - 800
4 u = 800
1 u = 800 ÷ 4 = 200
Number of stickers that Adam and Bryan have
= 2 u + 1 u
= 3 u
= 3 x 200
= 600
(b)
Number of stickers that Bryan has less than Adam
= 2 u - 1u
= 1 u
= 1 x 200
= 200
(c)
Number of stickers that Bryan has less than Adam and Charlie
= (2 u + 1 u + 800) - 1 u
= 2 u + 800
= 2 x 200 + 800
= 400 + 800
= 1200
Answer(s); (a) 600; (b) 200; (c) 1200