3 children have a total of 800 stickers.
Charlie has 3 times as many stickers as Bryan.
Adam has 300 stickers more stickers than Bryan.

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

(a)
Choose the person with least stickers to be 1 u.

Number of stickers that Bryan has = 1 u
Number of stickers that Charlie has = 3 u = 3 u
Number of stickers that Adam has = 1 u + 300

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

5 u + 300 = 800
5 u = 800 - 300
5 u = 500

1 u = 500 ÷ 5 = 100

Number of stickers that Charlie and Bryan have
= 3 u + 1 u
= 4 u
= 4 x 100
= 400

(b)
Number of stickers that Bryan has less than Charlie
= 3 u - 1u
= 2 u
= 2 x 100
= 200

(c)
Number of stickers that Bryan has less than Charlie and Adam
= (3 u + 1 u + 300) - 1 u
= 3 u + 300
= 3 x 100 + 300
= 300 + 300
= 600

Answer(s); (a) 400; (b) 200; (c) 600