Abi had 90% as many jelly beans as Cindy. Abi gave away 20% of her jelly beans and Cindy bought another 20 jelly beans. As a result, Abi now has 70% as many jelly beans as Cindy. Find the number of jelly beans that Abi had in the end.
| |
Abi |
Cindy |
| Before |
9x7 |
10x7 |
| Change |
- 1.8x7 |
+ 20 |
| After |
7.2x7 |
10x7 + 20 |
Comparing Abi and
Cindy in the end |
7x7.2 |
10x7.2 |
| |
Abi |
Cindy |
| 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 Abi had in the end is repeated.
Make the number of jelly beans that Abi had in the end the same.
The number of jelly beans that Cindy 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 Abi had in the end
= 50.4 u
= 50.4 x 10
= 504
Answer: 504
