Mark had 266 more stamps than Oscar at first. Then Mark bought 60 more stamps. In the end, Mark has 3 times as many stamps as Oscar.
- How many stamps did Oscar have?
- Find the total number of stamps Mark and Oscar had in the end?
| |
Mark |
Oscar |
Total |
| Before |
1 u + 266 |
1 u |
|
| Change |
+ 60 |
|
|
| After |
1 u + 266 + 60 |
1 u |
4 u |
(a)
Before
Number of stamps that Mark had = 1 u + 266
Number of stamps that Oscar had = 1 u
After
Number of stamps that Mark had = 1 u + 266 + 60 = 3 u
Number of stamps that Oscar had = 1 u
1 u + 266 + 60 = 3u
1 u + 326 = 3 u
3 u - 1 u = 326
2 u = 326
1 u = 326 ÷ 2 = 163
(a)
Number of stamps that Oscar had
= 1 u
= 163
(b)
Number of stamps that Mark and Oscar had in the end
= 3 u + 1 u
= 4 u
= 4 x 163
= 652
Answer(s): (a) 163; (b) 652
