Emma and Mary had the same number of beads. After Emma had given away 72 beads, Mary had 9 times as many beads as Emma. How many beads did each of them have at first?
| |
Emma |
Mary |
| Before |
1 u + 72 |
9 u |
| Change |
- 72 |
|
| After |
1 u |
9 u |
Number of beads that Mary had remains unchanged.
Number of beads that Emma and Mary had at first is equal.
9 u = 1 u + 72
9 u - 1 u = 72
8 u = 72
1 u = 72 ÷ 8= 9
Number of beads that each of them had at first
= 1 u + 72
= 9 + 72
= 81
Answer(s): 81
