Wendy and Lynn collected stamps. Wendy gave 20% of her stamps to Lynn. As a result, Lynn's stamps increased by 80%. If Wendy had 64 stamps left, find the total number of stamps the two girls had at first.
| |
Wendy |
Lynn |
Comparing the change
in Lynn's stamps |
| Before |
5x4 =
20 u |
|
5x1 =
5 u |
| Change |
- 1x4 =
- 4 u |
+ 1x4 =
+ 4 u |
+ 4x1 =
+ 4 u |
| After |
4x4 =
16 u |
|
9x1 =
9 u |
20% =
20100 =
15 80% =
80100 =
45 The number of stamps that Wendy gave to Lynn is repeated. Make the number of stamps that Wendy gave to Lynn the same. LCM of 1 and 4 is 4.
Number of stamps that Wendy had in the end = 16 u
16 u = 64
1 u = 64 ÷ 16 = 4
Number of stamps that Wendy and Lynn had at first
= 20 u + 5 u
= 25 u
= 25 x 4
= 100
Answer(s): 100
