Yoko and Erika collected buttons. Yoko gave 25% of her buttons to Erika. As a result, Erika's buttons increased by 80%. If Yoko had 96 buttons left, find the total number of buttons the two girls had at first.
| |
Yoko |
Erika |
Comparing the change
in Erika's buttons |
| Before |
4x4 =
16 u |
|
5x1 =
5 u |
| Change |
- 1x4 =
- 4 u |
+ 1x4 =
+ 4 u |
+ 4x1 =
+ 4 u |
| After |
3x4 =
12 u |
|
9x1 =
9 u |
25% =
25100 =
14 80% =
80100 =
45 The number of buttons that Yoko gave to Erika is repeated. Make the number of buttons that Yoko gave to Erika the same. LCM of 1 and 4 is 4.
Number of buttons that Yoko had in the end = 12 u
12 u = 96
1 u = 96 ÷ 12 = 8
Number of buttons that Yoko and Erika had at first
= 16 u + 5 u
= 21 u
= 21 x 8
= 168
Answer(s): 168
