3 children have a total of 800 stickers.
Charlie has 5 times as many stickers as Adam.
Bryan has 100 stickers more stickers than Adam.

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

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

Number of stickers that Adam has = 1 u
Number of stickers that Charlie has = 5 u = 5 u
Number of stickers that Bryan has = 1 u + 100

Total number of stickers
= 1 u + 5 u + 1 u + 100
= 7 u + 100

7 u + 100 = 800
7 u = 800 - 100
7 u = 700

1 u = 700 ÷ 7 = 100

Number of stickers that Charlie and Adam have
= 5 u + 1 u
= 6 u
= 6 x 100
= 600

(b)
Number of stickers that Adam has less than Charlie
= 5 u - 1u
= 4 u
= 4 x 100
= 400

(c)
Number of stickers that Adam has less than Charlie and Bryan
= (5 u + 1 u + 100) - 1 u
= 5 u + 100
= 5 x 100 + 100
= 500 + 100
= 600

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