Cindy had 80% as many jelly beans as Risa. Cindy gave away 10% of her jelly beans and Risa bought another 60 jelly beans. As a result, Cindy now has 60% as many jelly beans as Risa. Find the number of jelly beans that Cindy had in the end.
| |
Cindy |
Risa |
| Before |
4x3 |
5x3 |
| Change |
- 0.4x3 |
+ 60 |
| After |
3.6x3 |
5x3 + 60 |
Comparing Cindy and
Risa in the end |
3x3.6 |
5x3.6 |
| |
Cindy |
Risa |
| Before |
12 u |
15 u |
| Change |
- 1.2 u |
+ 60 |
After
|
10.8 u
|
15 u + 60 =
18 u |
80% =
80100 =
4510% x 4
=
10100 x 4
= 0.4
60% =
60100 =
35The number of jelly beans that Cindy had in the end is repeated.
Make the number of jelly beans that Cindy had in the end the same.
The number of jelly beans that Risa had in the end is repeated.
15 u + 60 = 18 u
18 u - 15 u = 60
3 u = 60
1 u = 60 ÷ 3 = 20
Number of jelly beans that Cindy had in the end
= 10.8 u
= 10.8 x 20
= 216
Answer: 216
