Fanny had 90% as many chocolate bars as Emily. Fanny gave away 10% of her chocolate bars and Emily bought another 210 chocolate bars. As a result, Fanny now has 60% as many chocolate bars as Emily. Find the number of chocolate bars that Fanny had in the end.
| |
Fanny |
Emily |
| Before |
9x3 |
10x3 |
| Change |
- 0.9x3 |
+ 210 |
| After |
8.1x3 |
10x3 + 210 |
Comparing Fanny and
Emily in the end |
3x8.1 |
5x8.1 |
| |
Fanny |
Emily |
| Before |
27 u |
30 u |
| Change |
- 2.7 u |
+ 210 |
After
|
24.3 u
|
30 u + 210 =
40.5 u |
90% =
90100 =
91010% x 9
=
10100 x 9
= 0.9
60% =
60100 =
35The number of chocolate bars that Fanny had in the end is repeated.
Make the number of chocolate bars that Fanny had in the end the same.
The number of chocolate bars that Emily had in the end is repeated.
30 u + 210 = 40.5 u
40.5 u - 30 u = 210
10.5 u = 210
1 u = 210 ÷ 10.5 = 20
Number of chocolate bars that Fanny had in the end
= 24.3 u
= 24.3 x 20
= 486
Answer: 486
