PSLE At a sale, Ryan bought 9 glasses of the same kind. His sister bought 6 such glasses. She also bought 4 cups at $7.40 each. Altogether, she spent $10.10 more than Ryan. What was the total amount of money Ryan and his sister spent?
|
Ryan |
His sister |
Items bought
|
9 glasses
|
6 glasses + 4 cups = 6 glasses + 29.60 |
Comparing the amounts paid |
|
$10.10 more |
Amount that his sister spent on 4 cups
= 4 x 7.40
= $29.60
Let the cost of 1 glass be 1 G.
If Ryan's sister spent $10.10 less, each would pay the same amount.
9 G + 10.10 = 6 G + 29.60 - 10.10
9 G - 6 G = 29.60 - 10.10
3 G = 19.50
1 G = 19.50 ÷ 3 = 6.50
Total amount that Ryan and his sister spent
= 9 G + 6 G + 29.60
= 15 G + 29.60
= 15 x 6.50 + 29.60
= 97.50 + 29.60
= $127.10
Answer(s): $127.10