Erika and Rachel had the same number of beads. After Erika had given away 72 beads, Rachel had 3 times as many beads as Erika. How many beads did each of them have at first?
| |
Erika |
Rachel |
| Before |
1 u + 72 |
3 u |
| Change |
- 72 |
|
| After |
1 u |
3 u |
Number of beads that Rachel had remains unchanged.
Number of beads that Erika and Rachel had at first is equal.
3 u = 1 u + 72
3 u - 1 u = 72
2 u = 72
1 u = 72 ÷ 2= 36
Number of beads that each of them had at first
= 1 u + 72
= 36 + 72
= 108
Answer(s): 108
