Sabrina had 70% as many jelly beans as Nora. Sabrina gave away 10% of her jelly beans and Nora bought another 15 jelly beans. As a result, Sabrina now has 60% as many jelly beans as Nora. Find the number of jelly beans that Nora had at first.
| |
Sabrina |
Nora |
| Before |
7x3 |
10x3 |
| Change |
- 0.7x3 |
+ 15 |
| After |
6.3x3 |
10x3 + 15 |
Comparing Sabrina and
Nora in the end |
3x6.3 |
5x6.3 |
| |
Sabrina |
Nora |
| Before |
21 u |
30 u |
| Change |
- 2.1 u |
+ 15 |
After
|
18.9 u
|
30 u + 15 =
31.5 u |
70% =
70100 =
71010% x 7
=
10100 x 7
= 0.7
60% =
60100 =
35The number of jelly beans that Sabrina had in the end is repeated.
Make the number of jelly beans that Sabrina had in the end the same.
The number of jelly beans that Nora had in the end is repeated.
30 u + 15 = 31.5 u
31.5 u - 30 u = 15
1.5 u = 15
1 u = 15 ÷ 1.5 = 10
Number of jelly beans that Nora had at first
= 30 u
= 30 x 10
= 300
Answer: 300
