Gabriel had
310 as many buttons as Shannon. After Gabriel bought another 30 buttons, he had 12 less buttons than Shannon. How many buttons did Gabriel have at first?
|
Gabriel |
Shannon |
Before |
3 u |
10 u |
Change |
+ 30 |
|
After |
3 u + 30 |
10 u |
Shannon had 12 more buttons than Gabriel in the end. So, if Gabriel had another 12 buttons, he would have the same number of buttons as Shannon.
10 u = 3 u + 30 + 12
10 u - 3 u = 30 + 12
7 u = 42
1 u = 42 ÷ 7 = 6
Number of buttons that Gabriel had at first
= 3 u
= 3 x 6
= 18
Answer: 18