On Friday, Yoko, Nora, Ivory and Mary spent a total of $195. On Saturday, Yoko spent twice of what she spent on Friday, Nora spent the same as what she spent on Friday, Ivory spent $17 less than what she spent on Friday, and Mary spent $12 more than what she spent on Friday. All of them spent an equal amount on Saturday. How much did Yoko and Mary spend altogether on Friday?
| |
Yoko |
Nora |
Ivory |
Mary |
Total |
| Before |
1 u |
3 u |
3 u + $17 |
3 u - $12 |
$195 |
| Change |
x 3 |
|
- $17 |
+ $12 |
|
| After |
3 u |
3 u |
3 u |
3 u |
|
Total amount that the four girls spent on Friday
= 1 u + 3 u + 3 u + 17 + 3 u - 12
= 10 u + 17 - 12
= 10 u + 5
10 u + 5 = 195
10 u = 195 - 5
10 u = 190
1 u = 190 ÷ 10 = 19
Total amount that Yoko and Mary spent on Friday
= 1 u + 3 u - 12
= 4 u - 12
= 4 x 19 - 12
= 76 - 12
= $64
Answer(s): $64
