3 children have a total of 1200 stickers.
Bryan has 3 times as many stickers as Charlie.
Adam has 900 stickers more stickers than Charlie.
- How many stickers do Bryan and Charlie have?
- How many stickers does Charlie have less than Bryan?
- How many stickers does Charlie have less than Bryan and Adam?
(a)
Choose the person with least stickers to be 1 u.
Number of stickers that Charlie has = 1 u
Number of stickers that Bryan has = 3 u = 3 u
Number of stickers that Adam has = 1 u + 900
Total number of stickers
= 1 u + 3 u + 1 u + 900
= 5 u + 900
5 u + 900 = 1200
5 u = 1200 - 900
5 u = 300
1 u = 300 ÷ 5 = 60
Number of stickers that Bryan and Charlie have
= 3 u + 1 u
= 4 u
= 4 x 60
= 240
(b)
Number of stickers that Charlie has less than Bryan
= 3 u - 1u
= 2 u
= 2 x 60
= 120
(c)
Number of stickers that Charlie has less than Bryan and Adam
= (3 u + 1 u + 900) - 1 u
= 3 u + 900
= 3 x 60 + 900
= 180 + 900
= 1080
Answer(s); (a) 240; (b) 120; (c) 1080