Min had 80% as many chocolate bars as Fiona. Min gave away 10% of her chocolate bars and Fiona bought another 15 chocolate bars. As a result, Min now has 60% as many chocolate bars as Fiona. Find the number of chocolate bars that Fiona had at first.
| |
Min |
Fiona |
| Before |
4x3 |
5x3 |
| Change |
- 0.4x3 |
+ 15 |
| After |
3.6x3 |
5x3 + 15 |
Comparing Min and
Fiona in the end |
3x3.6 |
5x3.6 |
| |
Min |
Fiona |
| Before |
12 u |
15 u |
| Change |
- 1.2 u |
+ 15 |
After
|
10.8 u
|
15 u + 15 =
18 u |
80% =
80100 =
4510% x 4
=
10100 x 4
= 0.4
60% =
60100 =
35The number of chocolate bars that Min had in the end is repeated.
Make the number of chocolate bars that Min had in the end the same.
The number of chocolate bars that Fiona had in the end is repeated.
15 u + 15 = 18 u
18 u - 15 u = 15
3 u = 15
1 u = 15 ÷ 3 = 5
Number of chocolate bars that Fiona had at first
= 15 u
= 15 x 5
= 75
Answer: 75
