Marion and Shannon collected stamps. Shannon gave 80% of her stamps to Marion. As a result, Marion's stamps increased by 20%. If Marion had 288 stamps left, find the total number of stamps the two girls had at first.
| |
Comparing the change
in Shannon's stamps |
Shannon |
Marion |
| Before |
5x1 =
5 u |
|
5x4 =
20 u |
| Change |
- 4x1 =
- 4 u |
- 1x4 =
- 4 u |
+ 1x4 =
+ 4 u |
| After |
1x1 =
1 u |
|
6x4 =
24 u |
80% =
80100 =
45 20% =
20100 =
15 The number of stamps that Marion gave to Shannon is repeated. Make the number of stamps that Marion gave to Shannon the same. LCM of 1 and 4 is 4.
Number of stamps that Marion had in the end = 24 u
24 u = 288
1 u = 288 ÷ 24 = 12
Number of stamps that Shannon and Marion had at first
= 5 u + 20 u
= 25 u
= 25 x 12
= 300
Answer(s): 300
