Hilda had 50 more pens than Joelle. After Joelle gave away
13 of her pens, Hilda had four times as many pens as Joelle. How many pens did Joelle have at first?
| |
Hilda |
Joelle |
Comparing Hilda and
Joelle at first |
50 more |
|
| Before |
8 u |
3 u |
| Change |
|
- 1 u |
| After |
8 u |
2 u |
Comparing Hilda and
Joelle in the end |
4x2 =
8 u |
1x2 =
2 u |
Number of pens that Joelle had in the end is repeated. Make the number of pens that Joelle had in the end the same. LCM of 1 and 2 is 2.
Number of pens that Hilda had at first = 8 u
Number of pens that Hilda had more than Joelle at first
= 8 u - 3 u
= 5 u
5 u = 50
1 u = 50 ÷ 5 = 10
Number of pens that Joelle had at first
= 3 u
= 3 x 10
= 30
Answer(s): 30
