Gillian had 90% as many lollipops as Lucy. Gillian gave away 20% of her lollipops and Lucy bought another 40 lollipops. As a result, Gillian now has 70% as many lollipops as Lucy. Find the number of lollipops that Gillian had in the end.
| |
Gillian |
Lucy |
| Before |
9x7 |
10x7 |
| Change |
- 1.8x7 |
+ 40 |
| After |
7.2x7 |
10x7 + 40 |
Comparing Gillian and
Lucy in the end |
7x7.2 |
10x7.2 |
| |
Gillian |
Lucy |
| Before |
63 u |
70 u |
| Change |
- 12.6 u |
+ 40 |
After
|
50.4 u
|
70 u + 40 =
72 u |
90% =
90100 =
91020% x 9
=
20100 x 9
= 1.8
70% =
70100 =
710The number of lollipops that Gillian had in the end is repeated.
Make the number of lollipops that Gillian had in the end the same.
The number of lollipops that Lucy had in the end is repeated.
70 u + 40 = 72 u
72 u - 70 u = 40
2 u = 40
1 u = 40 ÷ 2 = 20
Number of lollipops that Gillian had in the end
= 50.4 u
= 50.4 x 20
= 1008
Answer: 1008
