Esther and Jane have some cupcakes each. If Esther gives Jane 26 cupcakes, Esther will have
49 as many cupcakes as Jane. If Esther gives Jane 19 cupcakes, they will have an equal number of cupcakes. How many cupcakes does Esther have at first?
|
Case 1 |
Case 2 |
|
Esther |
Jane |
Esther |
Jane |
Before |
4 u + 26 |
9 u - 26 |
6.5 u + 19 |
6.5 u - 19 |
Change |
- 26 |
+ 26 |
- 19 |
+ 19 |
After |
4 u |
9 u |
6.5 u |
6.5 u |
Total number of cupcakes that Esther and Jane have
= 4 u + 9 u
= 13 u
Number of cupcakes that Esther and Jane each has in the end is the same.
Number of cupcakes that Esther and Jane each has in the end in Case 2
= 13 u ÷ 2
= 6.5 u
Number of cupcakes that Esther had at first is the same in Case 1 and Case 2.
6.5 u + 19 = 4 u + 26
6.5 u - 4 u = 26 - 19
0.5 u = 7
1 u = 7 ÷ 0.5 = 14
Number of cupcakes that Esther has
= 4 u + 26
= 4 x 14 + 26
= 56 + 26
= 82
Answer(s): 82