Yoko had 64 more pens than Shannon. After Shannon gave away
25 of her pens, Yoko had thrice as many pens as Shannon. How many pens did Shannon have at first?
| |
Yoko |
Shannon |
Comparing Yoko
and Shannon at first |
64 more |
|
| Before |
9 u |
5 u |
| Change |
|
- 2 u |
| After |
|
3 u |
Comparing Yoko
and Shannon in the end |
3x3 =
9 u |
1x3 =
3 u |
The number of pens that Yoko had at first and in the end remains unchanged. Make the number of pens that Yoko had the same. LCM of 9 and 3 is 9.
Number of pens that Yoko had more than Shannon at first
= 9 u - 5 u
= 4 u
4 u = 64
1 u = 64 ÷ 4 = 16
Number of pens that Shannon had at first
= 5 u
= 5 x 16
= 80
Answer(s): 80
