Lynn and Xandra collected pens. Lynn gave 25% of her pens to Xandra. As a result, Xandra's pens increased by 75%. If Lynn had 18 pens left, find the total number of pens the two girls had at first.
| |
Lynn |
Xandra |
Comparing the change
in Xandra's pens |
| Before |
4x3 =
12 u |
|
4x1 =
4 u |
| Change |
- 1x3 =
- 3 u |
+ 1x3 =
+ 3 u |
+ 3x1 =
+ 3 u |
| After |
3x3 =
9 u |
|
7x1 =
7 u |
25% =
25100 =
14 75% =
75100 =
34 The number of pens that Lynn gave to Xandra is repeated. Make the number of pens that Lynn gave to Xandra the same. LCM of 1 and 3 is 3.
Number of pens that Lynn had in the end = 9 u
9 u = 18
1 u = 18 ÷ 9 = 2
Number of pens that Lynn and Xandra had at first
= 12 u + 4 u
= 16 u
= 16 x 2
= 32
Answer(s): 32
