Shiyun and Justin went shopping with a total of $78. After Shiyun spent
13 of her money and Justin spent
45 of his money, they each had an equal amount of money left. How much money did they spend altogether?
| |
Shiyun |
Justin |
Total |
Before |
3 u |
5x2 =
10 u |
$78 |
Change |
- 1 u |
- 4x2 =
- 8 u |
|
After |
2 u |
1x2 =
2 u |
|
The amount that Shiyun and Justin each had in the end is the same. Make the amount that each had in the end the same. LCM of 2 and 1 is 2.
Total amount that Shiyun and Justin had at first
= 3 u + 10 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Total amount that Shiyun and Justin spent
= 1 u + 8 u
= 9 u
= 9 x 6
= $54
Answer(s): $54
