Yoko had 80% as many sweets as Fiona. Yoko gave away 10% of her sweets and Fiona bought another 15 sweets. As a result, Yoko now has 60% as many sweets as Fiona. Find the number of sweets that Fiona had at first.
| |
Yoko |
Fiona |
| Before |
4x3 |
5x3 |
| Change |
- 0.4x3 |
+ 15 |
| After |
3.6x3 |
5x3 + 15 |
Comparing Yoko and
Fiona in the end |
3x3.6 |
5x3.6 |
| |
Yoko |
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 sweets that Yoko had in the end is repeated.
Make the number of sweets that Yoko had in the end the same.
The number of sweets 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 sweets that Fiona had at first
= 15 u
= 15 x 5
= 75
Answer: 75
