Shiyun and Lynn collected buttons. Shiyun gave 25% of her buttons to Lynn. As a result, Lynn's buttons increased by 60%. If Shiyun had 72 buttons left, find the total number of buttons the two girls had at first.
| |
Shiyun |
Lynn |
Comparing the change
in Lynn's buttons |
| Before |
4x3 =
12 u |
|
5x1 =
5 u |
| Change |
- 1x3 =
- 3 u |
+ 1x3 =
+ 3 u |
+ 3x1 =
+ 3 u |
| After |
3x3 =
9 u |
|
8x1 =
8 u |
25% =
25100 =
14 60% =
60100 =
35 The number of buttons that Shiyun gave to Lynn is repeated. Make the number of buttons that Shiyun gave to Lynn the same. LCM of 1 and 3 is 3.
Number of buttons that Shiyun had in the end = 9 u
9 u = 72
1 u = 72 ÷ 9 = 8
Number of buttons that Shiyun and Lynn had at first
= 12 u + 5 u
= 17 u
= 17 x 8
= 136
Answer(s): 136
