Vanessa had 90% as many lollipops as Wendy. Vanessa gave away 20% of her lollipops and Wendy bought another 10 lollipops. As a result, Vanessa now has 70% as many lollipops as Wendy. Find the number of lollipops that Vanessa had in the end.
| |
Vanessa |
Wendy |
| Before |
9x7 |
10x7 |
| Change |
- 1.8x7 |
+ 10 |
| After |
7.2x7 |
10x7 + 10 |
Comparing Vanessa and
Wendy in the end |
7x7.2 |
10x7.2 |
| |
Vanessa |
Wendy |
| 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 lollipops that Vanessa had in the end is repeated.
Make the number of lollipops that Vanessa had in the end the same.
The number of lollipops that Wendy 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 lollipops that Vanessa had in the end
= 50.4 u
= 50.4 x 5
= 252
Answer: 252
