3 children have a total of 1900 stickers.
Adam has 2 times as many stickers as Bryan.
Charlie has 400 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 + 400
Total number of stickers
= 1 u + 2 u + 1 u + 400
= 4 u + 400
4 u + 400 = 1900
4 u = 1900 - 400
4 u = 1500
1 u = 1500 ÷ 4 = 375
Number of stickers that Adam and Bryan have
= 2 u + 1 u
= 3 u
= 3 x 375
= 1125
(b)
Number of stickers that Bryan has less than Adam
= 2 u - 1u
= 1 u
= 1 x 375
= 375
(c)
Number of stickers that Bryan has less than Adam and Charlie
= (2 u + 1 u + 400) - 1 u
= 2 u + 400
= 2 x 375 + 400
= 750 + 400
= 1150
Answer(s); (a) 1125; (b) 375; (c) 1150