Roshel and Erika collected pens. Erika gave 60% of her pens to Roshel. As a result, Roshel's pens increased by 25%. If Roshel had 150 pens left, find the total number of pens the two girls had at first.
| |
Comparing the change
in Erika's pens |
Erika |
Roshel |
| Before |
5x1 =
5 u |
|
4x3 =
12 u |
| Change |
- 3x1 =
- 3 u |
- 1x3 =
- 3 u |
+ 1x3 =
+ 3 u |
| After |
2x1 =
2 u |
|
5x3 =
15 u |
60% =
60100 =
35 25% =
25100 =
14 The number of pens that Roshel gave to Erika is repeated. Make the number of pens that Roshel gave to Erika the same. LCM of 1 and 3 is 3.
Number of pens that Roshel had in the end = 15 u
15 u = 150
1 u = 150 ÷ 15 = 10
Number of pens that Erika and Roshel had at first
= 5 u + 12 u
= 17 u
= 17 x 10
= 170
Answer(s): 170
