Joelle had 90% as many jelly beans as Jade. Joelle gave away 20% of her jelly beans and Jade bought another 20 jelly beans. As a result, Joelle now has 70% as many jelly beans as Jade. Find the number of jelly beans that Joelle had in the end.
| |
Joelle |
Jade |
| Before |
9x7 |
10x7 |
| Change |
- 1.8x7 |
+ 20 |
| After |
7.2x7 |
10x7 + 20 |
Comparing Joelle and
Jade in the end |
7x7.2 |
10x7.2 |
| |
Joelle |
Jade |
| Before |
63 u |
70 u |
| Change |
- 12.6 u |
+ 20 |
After
|
50.4 u
|
70 u + 20 =
72 u |
90% =
90100 =
91020% x 9
=
20100 x 9
= 1.8
70% =
70100 =
710The number of jelly beans that Joelle had in the end is repeated.
Make the number of jelly beans that Joelle had in the end the same.
The number of jelly beans that Jade had in the end is repeated.
70 u + 20 = 72 u
72 u - 70 u = 20
2 u = 20
1 u = 20 ÷ 2 = 10
Number of jelly beans that Joelle had in the end
= 50.4 u
= 50.4 x 10
= 504
Answer: 504
