Xuan and Rachel collected stamps. Xuan gave 40% of her stamps to Rachel. As a result, Rachel's stamps increased by 60%. If Xuan had 27 stamps left, find the total number of stamps the two girls had at first.
| |
Xuan |
Rachel |
Comparing the change
in Rachel's stamps |
| Before |
5x3 =
15 u |
|
5x2 =
10 u |
| Change |
- 2x3 =
- 6 u |
+ 2x3 =
+ 6 u |
+ 3x2 =
+ 6 u |
| After |
3x3 =
9 u |
|
8x2 =
16 u |
40% =
40100 =
25 60% =
60100 =
35 The number of stamps that Xuan gave to Rachel is repeated. Make the number of stamps that Xuan gave to Rachel the same. LCM of 2 and 3 is 6.
Number of stamps that Xuan had in the end = 9 u
9 u = 27
1 u = 27 ÷ 9 = 3
Number of stamps that Xuan and Rachel had at first
= 15 u + 10 u
= 25 u
= 25 x 3
= 75
Answer(s): 75
