Adam and Bryan have 420 stickers.
After Adam gives Bryan 42 stickers,
Adam has 390 more stickers than Bryan.
- How many stickers does Adam have at first?
- How many stickers does Bryan have in the end?
|
Adam |
Bryan |
Before |
1 u + 432 |
1 u - 42 |
Change |
- 42 |
+ 42 |
After |
1 u + 390 |
1 u |
(a)
Total number of stickers
= 1 u + 1 u + 390
= 2 u + 390
2 u + 390 = 420
2 u = 420 - 390
2 u = 30
1 u = 30 ÷ 2 = 15
Number of stickers that Adam has at first
= 1 u + 432
= 15 + 432
= 447
(b)
Number of stickers that Bryan has in the end
= 1 u
= 15
Answer(s): (a) 447; (b) 15