On Friday, Tammy, Jean, Yoko and Risa spent a total of $207. On Saturday, Tammy spent twice of what she spent on Friday, Jean spent the same as what she spent on Friday, Yoko spent $13 less than what she spent on Friday, and Risa spent $6 more than what she spent on Friday. All of them spent an equal amount on Saturday. How much did Tammy and Risa spend altogether on Friday?
| |
Tammy |
Jean |
Yoko |
Risa |
Total |
| Before |
1 u |
3 u |
3 u + $13 |
3 u - $6 |
$207 |
| Change |
x 3 |
|
- $13 |
+ $6 |
|
| After |
3 u |
3 u |
3 u |
3 u |
|
Total amount that the four girls spent on Friday
= 1 u + 3 u + 3 u + 13 + 3 u - 6
= 10 u + 13 - 6
= 10 u + 7
10 u + 7 = 207
10 u = 207 - 7
10 u = 200
1 u = 200 ÷ 10 = 20
Total amount that Tammy and Risa spent on Friday
= 1 u + 3 u - 6
= 4 u - 6
= 4 x 20 - 6
= 80 - 6
= $74
Answer(s): $74
