PSLE At a sale, Zeph bought 9 wine glasses of the same kind. His cousin bought 6 such wine glasses. She also bought 2 mugs at $1.70 each. Altogether, she spent $20.90 less than Zeph. What was the total amount of money Zeph and his cousin spent?
|
Zeph |
His cousin |
Items bought
|
9 wine glasses
|
6 wine glasses + 2 mugs = 6 wine glasses + 3.40 |
Comparing the amounts paid |
$20.90 more |
|
Amount that his cousin spent on 2 mugs
= 2 x 1.70
= $3.40
Let the cost of 1 wine glass be 1 W.
If Zeph spent $20.90 less, each would pay the same amount.
9 W - 20.90 = 6 W + 3.40
9 W - 6 W = 3.40 + 20.90
9 W - 6 W = 24.30
3 W = 24.30
1 W = 24.30 ÷ 3 = 8.10
Total amount that Zeph and his cousin spent
= 9 W + 6 W + 3.40
= 15 W + 3.40
= 15 x 8.10 + 3.40
= 121.50 + 3.40
= $124.90
Answer(s): $124.90