3 children have a total of 900 stickers.
Adam has 3 times as many stickers as Bryan.
Charlie has 100 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 = 3 u = 3 u
Number of stickers that Charlie has = 1 u + 100
Total number of stickers
= 1 u + 3 u + 1 u + 100
= 5 u + 100
5 u + 100 = 900
5 u = 900 - 100
5 u = 800
1 u = 800 ÷ 5 = 160
Number of stickers that Adam and Bryan have
= 3 u + 1 u
= 4 u
= 4 x 160
= 640
(b)
Number of stickers that Bryan has less than Adam
= 3 u - 1u
= 2 u
= 2 x 160
= 320
(c)
Number of stickers that Bryan has less than Adam and Charlie
= (3 u + 1 u + 100) - 1 u
= 3 u + 100
= 3 x 160 + 100
= 480 + 100
= 580
Answer(s); (a) 640; (b) 320; (c) 580