Lynn had 90% as many chocolate bars as Yoko. Lynn gave away 10% of her chocolate bars and Yoko bought another 210 chocolate bars. As a result, Lynn now has 60% as many chocolate bars as Yoko. Find the number of chocolate bars that Lynn had in the end.
| |
Lynn |
Yoko |
| Before |
9x3 |
10x3 |
| Change |
- 0.9x3 |
+ 210 |
| After |
8.1x3 |
10x3 + 210 |
Comparing Lynn and
Yoko in the end |
3x8.1 |
5x8.1 |
| |
Lynn |
Yoko |
| 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 Lynn had in the end is repeated.
Make the number of chocolate bars that Lynn had in the end the same.
The number of chocolate bars that Yoko 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 Lynn had in the end
= 24.3 u
= 24.3 x 20
= 486
Answer: 486
