Eric had
310 as many beads as Gabby. After Eric bought another 109 beads, he had 17 less beads than Gabby. How many beads did Eric have at first?
|
Eric |
Gabby |
Before |
3 u |
10 u |
Change |
+ 109 |
|
After |
3 u + 109 |
10 u |
Gabby had 17 more beads than Eric in the end. So, if Eric had another 17 beads, he would have the same number of beads as Gabby.
10 u = 3 u + 109 + 17
10 u - 3 u = 109 + 17
7 u = 126
1 u = 126 ÷ 7 = 18
Number of beads that Eric had at first
= 3 u
= 3 x 18
= 54
Answer: 54