Bobby had
29 as many beads as Gabby. After Bobby gave away 31 beads, he had 87 less beads than Gabby. How many beads did Gabby have?
| |
Bobby |
Gabby |
| Before |
2 u |
9 u |
| Change |
- 31 |
|
| After |
2 u - 31 |
9 u |
Gabby had 87 more beads than Bobby in the end. So, if Bobby had another 87 beads, he would have the same number of beads as Gabby.
9 u = 2 u - 31 + 87
9 u - 2 u = 87 - 31
7 u = 56
1 u = 56 ÷ 7 = 8
Number of beads that Gabby had at first
= 9 u
= 9 x 8
= 72
Answer: 72
