Cindy and Ivory had the same number of pens. After Cindy had given away 60 pens, Ivory had 3 times as many pens as Cindy. How many pens did each of them have at first?
| |
Cindy |
Ivory |
| Before |
1 u + 60 |
3 u |
| Change |
- 60 |
|
| After |
1 u |
3 u |
Number of pens that Ivory had remains unchanged.
Number of pens that Cindy and Ivory had at first is equal.
3 u = 1 u + 60
3 u - 1 u = 60
2 u = 60
1 u = 60 ÷ 2= 30
Number of pens that each of them had at first
= 1 u + 60
= 30 + 60
= 90
Answer(s): 90
