PSLE At a sale, Oscar bought 7 wine glasses of the same kind. His cousin bought 4 such wine glasses. She also bought 5 cups at $7.70 each. Altogether, she spent $15.70 more than Oscar. What was the total amount of money Oscar and his cousin spent?
|
Oscar |
His cousin |
Items bought
|
7 wine glasses
|
4 wine glasses + 5 cups = 4 wine glasses + 38.50 |
Comparing the amounts paid |
|
$15.70 more |
Amount that his cousin spent on 5 cups
= 5 x 7.70
= $38.50
Let the cost of 1 wine glass be 1 W.
If Oscar's cousin spent $15.70 less, each would pay the same amount.
7 W + 15.70 = 4 W + 38.50 - 15.70
7 W - 4 W = 38.50 - 15.70
3 W = 22.80
1 W = 22.80 ÷ 3 = 7.60
Total amount that Oscar and his cousin spent
= 7 W + 4 W + 38.50
= 11 W + 38.50
= 11 x 7.60 + 38.50
= 83.60 + 38.50
= $122.10
Answer(s): $122.10