3 children have a total of 1600 stickers.
Bryan has 3 times as many stickers as Adam.
Charlie has 400 stickers more stickers than Adam.
- How many stickers do Bryan and Adam have?
- How many stickers does Adam have less than Bryan?
- How many stickers does Adam have less than Bryan and Charlie?
(a)
Choose the person with least stickers to be 1 u.
Number of stickers that Adam has = 1 u
Number of stickers that Bryan has = 3 u = 3 u
Number of stickers that Charlie has = 1 u + 400
Total number of stickers
= 1 u + 3 u + 1 u + 400
= 5 u + 400
5 u + 400 = 1600
5 u = 1600 - 400
5 u = 1200
1 u = 1200 ÷ 5 = 240
Number of stickers that Bryan and Adam have
= 3 u + 1 u
= 4 u
= 4 x 240
= 960
(b)
Number of stickers that Adam has less than Bryan
= 3 u - 1u
= 2 u
= 2 x 240
= 480
(c)
Number of stickers that Adam has less than Bryan and Charlie
= (3 u + 1 u + 400) - 1 u
= 3 u + 400
= 3 x 240 + 400
= 720 + 400
= 1120
Answer(s); (a) 960; (b) 480; (c) 1120