Howard had some stamps at first. After he bought another 40 stamps, he had thrice as many stamps as before. How many stamps did Howard have at first?
| |
Stamps |
| Before |
1 u |
| Change |
+ 40 |
| After |
1 u + 40 = 3 u |
Number of stamps after he bought = 1 u + 40
Number of stamps that is thrice as many stamps as before = 3 x 1 u = 3 u
3 u = 1 u + 40
3 u - 1 u = 40
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Kim had at first
= 1 u
= 20
Answer(s): 20
