3 children have a total of 1900 stickers.
Bryan has 2 times as many stickers as Charlie.
Adam has 600 stickers more stickers than Charlie.

1. How many stickers do Bryan and Charlie have?
2. How many stickers does Charlie have less than Bryan?
3. 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 = 2 u = 2 u
Number of stickers that Adam has = 1 u + 600

Total number of stickers
= 1 u + 2 u + 1 u + 600
= 4 u + 600

4 u + 600 = 1900
4 u = 1900 - 600
4 u = 1300

1 u = 1300 ÷ 4 = 325

Number of stickers that Bryan and Charlie have
= 2 u + 1 u
= 3 u
= 3 x 325
= 975

(b)
Number of stickers that Charlie has less than Bryan
= 2 u - 1u
= 1 u
= 1 x 325
= 325

(c)
Number of stickers that Charlie has less than Bryan and Adam
= (2 u + 1 u + 600) - 1 u
= 2 u + 600
= 2 x 325 + 600
= 650 + 600
= 1250

Answer(s); (a) 975; (b) 325; (c) 1250