PSLE At a sale, Will bought 10 cups of the same kind. His cousin bought 8 such cups. She also bought 3 bowls at $1.50 each. Altogether, she spent $9.10 less than Will. What was the total amount of money Will and his cousin spent?
|
Will |
His cousin |
Items bought
|
10 cups
|
8 cups + 3 bowls = 8 cups + 4.50 |
Comparing the amounts paid |
$9.10 more |
|
Amount that his cousin spent on 3 bowls
= 3 x 1.50
= $4.50
Let the cost of 1 cup be 1 C.
If Will spent $9.10 less, each would pay the same amount.
10 C - 9.10 = 8 C + 4.50
10 C - 8 C = 4.50 + 9.10
10 C - 8 C = 13.60
2 C = 13.60
1 C = 13.60 ÷ 2 = 6.80
Total amount that Will and his cousin spent
= 10 C + 8 C + 4.50
= 18 C + 4.50
= 18 x 6.80 + 4.50
= 122.40 + 4.50
= $126.90
Answer(s): $126.90