PSLE At a sale, Perry bought 10 bowls of the same kind. His sister bought 7 such bowls. She also bought 3 wine glasses at $7.80 each. Altogether, she spent $2.10 more than Perry. What was the total amount of money Perry and his sister spent?
|
Perry |
His sister |
Items bought
|
10 bowls
|
7 bowls + 3 wine glasses = 7 bowls + 23.40 |
Comparing the amounts paid |
|
$2.10 more |
Amount that his sister spent on 3 wine glasses
= 3 x 7.80
= $23.40
Let the cost of 1 bowl be 1 B.
If Perry's sister spent $2.10 less, each would pay the same amount.
10 B + 2.10 = 7 B + 23.40 - 2.10
10 B - 7 B = 23.40 - 2.10
3 B = 21.30
1 B = 21.30 ÷ 3 = 7.10
Total amount that Perry and his sister spent
= 10 B + 7 B + 23.40
= 17 B + 23.40
= 17 x 7.10 + 23.40
= 120.70 + 23.40
= $144.10
Answer(s): $144.10