Lucy had 90% as many chocolate bars as Kimberly. Lucy gave away 20% of her chocolate bars and Kimberly bought another 60 chocolate bars. As a result, Lucy now has 60% as many chocolate bars as Kimberly. Find the number of chocolate bars that Lucy had in the end.
| |
Lucy |
Kimberly |
| Before |
9x3 |
10x3 |
| Change |
- 1.8x3 |
+ 60 |
| After |
7.2x3 |
10x3 + 60 |
Comparing Lucy and
Kimberly in the end |
3x7.2 |
5x7.2 |
| |
Lucy |
Kimberly |
| Before |
27 u |
30 u |
| Change |
- 5.4 u |
+ 60 |
After
|
21.6 u
|
30 u + 60 =
36 u |
90% =
90100 =
91020% x 9
=
20100 x 9
= 1.8
60% =
60100 =
35The number of chocolate bars that Lucy had in the end is repeated.
Make the number of chocolate bars that Lucy had in the end the same.
The number of chocolate bars that Kimberly had in the end is repeated.
30 u + 60 = 36 u
36 u - 30 u = 60
6 u = 60
1 u = 60 ÷ 6 = 10
Number of chocolate bars that Lucy had in the end
= 21.6 u
= 21.6 x 10
= 216
Answer: 216
