Julie had 90% as many chocolate bars as Marion. Julie gave away 20% of her chocolate bars and Marion bought another 10 chocolate bars. As a result, Julie now has 70% as many chocolate bars as Marion. Find the number of chocolate bars that Julie had in the end.
| |
Julie |
Marion |
| Before |
9x7 |
10x7 |
| Change |
- 1.8x7 |
+ 10 |
| After |
7.2x7 |
10x7 + 10 |
Comparing Julie and
Marion in the end |
7x7.2 |
10x7.2 |
| |
Julie |
Marion |
| Before |
63 u |
70 u |
| Change |
- 12.6 u |
+ 10 |
After
|
50.4 u
|
70 u + 10 =
72 u |
90% =
90100 =
91020% x 9
=
20100 x 9
= 1.8
70% =
70100 =
710The number of chocolate bars that Julie had in the end is repeated.
Make the number of chocolate bars that Julie had in the end the same.
The number of chocolate bars that Marion had in the end is repeated.
70 u + 10 = 72 u
72 u - 70 u = 10
2 u = 10
1 u = 10 ÷ 2 = 5
Number of chocolate bars that Julie had in the end
= 50.4 u
= 50.4 x 5
= 252
Answer: 252
