Fanny and Joelle collected buttons. Fanny gave 25% of her buttons to Joelle. As a result, Joelle's buttons increased by 80%. If Fanny had 120 buttons left, find the total number of buttons the two girls had at first.
| |
Fanny |
Joelle |
Comparing the change
in Joelle'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 Fanny gave to Joelle is repeated. Make the number of buttons that Fanny gave to Joelle the same. LCM of 1 and 4 is 4.
Number of buttons that Fanny had in the end = 12 u
12 u = 120
1 u = 120 ÷ 12 = 10
Number of buttons that Fanny and Joelle had at first
= 16 u + 5 u
= 21 u
= 21 x 10
= 210
Answer(s): 210
