3 children have a total of 500 stickers.
Adam has 3 times as many stickers as Bryan.
Charlie has 300 stickers more stickers than Bryan.

1. How many stickers do Adam and Bryan have?
2. How many stickers does Bryan have less than Adam?
3. 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 + 300

Total number of stickers
= 1 u + 3 u + 1 u + 300
= 5 u + 300

5 u + 300 = 500
5 u = 500 - 300
5 u = 200

1 u = 200 ÷ 5 = 40

Number of stickers that Adam and Bryan have
= 3 u + 1 u
= 4 u
= 4 x 40
= 160

(b)
Number of stickers that Bryan has less than Adam
= 3 u - 1u
= 2 u
= 2 x 40
= 80

(c)
Number of stickers that Bryan has less than Adam and Charlie
= (3 u + 1 u + 300) - 1 u
= 3 u + 300
= 3 x 40 + 300
= 120 + 300
= 420

Answer(s); (a) 160; (b) 80; (c) 420