Vanessa and Hazel have some cupcakes each. If Vanessa gives Hazel 29 cupcakes, Vanessa will have
45 as many cupcakes as Hazel. If Vanessa gives Hazel 20 cupcakes, they will have an equal number of cupcakes. How many cupcakes does Vanessa have at first?
|
Case 1 |
Case 2 |
|
Vanessa |
Hazel |
Vanessa |
Hazel |
Before |
4 u + 29 |
5 u - 29 |
4.5 u + 20 |
4.5 u - 20 |
Change |
- 29 |
+ 29 |
- 20 |
+ 20 |
After |
4 u |
5 u |
4.5 u |
4.5 u |
Total number of cupcakes that Vanessa and Hazel have
= 4 u + 5 u
= 9 u
Number of cupcakes that Vanessa and Hazel each has in the end is the same.
Number of cupcakes that Vanessa and Hazel each has in the end in Case 2
= 9 u ÷ 2
= 4.5 u
Number of cupcakes that Vanessa had at first is the same in Case 1 and Case 2.
4.5 u + 20 = 4 u + 29
4.5 u - 4 u = 29 - 20
0.5 u = 9
1 u = 9 ÷ 0.5 = 18
Number of cupcakes that Vanessa has
= 4 u + 29
= 4 x 18 + 29
= 72 + 29
= 101
Answer(s): 101