PSLE At a sale, Harry bought 10 wine glasses of the same kind. His aunt bought 6 such wine glasses. She also bought 3 cups at $7.20 each. Altogether, she spent $3.20 less than Harry. What was the total amount of money Harry and his aunt spent?
|
Harry |
His aunt |
Items bought
|
10 wine glasses
|
6 wine glasses + 3 cups = 6 wine glasses + 21.60 |
Comparing the amounts paid |
$3.20 more |
|
Amount that his aunt spent on 3 cups
= 3 x 7.20
= $21.60
Let the cost of 1 wine glass be 1 W.
If Harry spent $3.20 less, each would pay the same amount.
10 W - 3.20 = 6 W + 21.60
10 W - 6 W = 21.60 + 3.20
10 W - 6 W = 24.80
4 W = 24.80
1 W = 24.80 ÷ 4 = 6.20
Total amount that Harry and his aunt spent
= 10 W + 6 W + 21.60
= 16 W + 21.60
= 16 x 6.20 + 21.60
= 99.20 + 21.60
= $120.80
Answer(s): $120.80