3 children have a total of 2500 stickers.
Bryan has 3 times as many stickers as Charlie.
Adam has 400 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 + 400
Total number of stickers
= 1 u + 3 u + 1 u + 400
= 5 u + 400
5 u + 400 = 2500
5 u = 2500 - 400
5 u = 2100
1 u = 2100 ÷ 5 = 420
Number of stickers that Bryan and Charlie have
= 3 u + 1 u
= 4 u
= 4 x 420
= 1680
(b)
Number of stickers that Charlie has less than Bryan
= 3 u - 1u
= 2 u
= 2 x 420
= 840
(c)
Number of stickers that Charlie has less than Bryan and Adam
= (3 u + 1 u + 400) - 1 u
= 3 u + 400
= 3 x 420 + 400
= 1260 + 400
= 1660
Answer(s); (a) 1680; (b) 840; (c) 1660