Fill in the blanks.
Adam and Bryan have 13 stickers.
Adam and Charlie have 21 stickers.
Charlie has thrice as many as stickers as Bryan.
- Number of stickers that Charlie has = _____ u
- 1 u = _____
- Number of stickers that Adam has = _____
(a)
Change information into units.
Charlie has thrice as many as stickers as Bryan.
Number of stickers that Bryan has = 1 u
Number of stickers that Charlie has = 3 u
(b)
Adam + 1 u = 13 --- (1)
Adam + 3 u = 21 --- (2)
(2) - (1)
3 u - 1 u = 21 - 13
2 u = 8
1 u = 8 ÷ 2 = 4
(c)
Number of stickers that Adam has
= 13 - 1 u
= 13 - 4
= 9
Answer(s): (a) 3; (b) 4; (c) 9