Riordan had
49 as many buttons as Fiona. After Riordan bought another 74 buttons, he had 16 less buttons than Fiona. How many buttons did Riordan have at first?
|
Riordan |
Fiona |
Before |
4 u |
9 u |
Change |
+ 74 |
|
After |
4 u + 74 |
9 u |
Fiona had 16 more buttons than Riordan in the end. So, if Riordan had another 16 buttons, he would have the same number of buttons as Fiona.
9 u = 4 u + 74 + 16
9 u - 4 u = 74 + 16
5 u = 90
1 u = 90 ÷ 5 = 18
Number of buttons that Riordan had at first
= 4 u
= 4 x 18
= 72
Answer: 72