Nora had 90 more pens than Elyse. After Elyse gave away
15 of her pens, Nora had five times as many pens as Elyse. How many pens did Elyse have at first?
| |
Nora |
Elyse |
Comparing Nora
and Elyse at first |
90 more |
|
| Before |
20 u |
5 u |
| Change |
|
- 1 u |
| After |
|
4 u |
Comparing Nora
and Elyse in the end |
5x4 =
20 u |
1x4 =
4 u |
The number of pens that Nora had at first and in the end remains unchanged. Make the number of pens that Nora had the same. LCM of 20 and 5 is 20.
Number of pens that Nora had more than Elyse at first
= 20 u - 5 u
= 15 u
15 u = 90
1 u = 90 ÷ 15 = 6
Number of pens that Elyse had at first
= 5 u
= 5 x 6
= 30
Answer(s): 30
