PSLE At a sale, Ken bought 9 glasses of the same kind. His sister bought 5 such glasses. She also bought 5 mugs at $7.30 each. Altogether, she spent $11.70 more than Ken. What was the total amount of money Ken and his sister spent?
|
Ken |
His sister |
Items bought
|
9 glasses
|
5 glasses + 5 mugs = 5 glasses + 36.50 |
Comparing the amounts paid |
|
$11.70 more |
Amount that his sister spent on 5 mugs
= 5 x 7.30
= $36.50
Let the cost of 1 glass be 1 G.
If Ken's sister spent $11.70 less, each would pay the same amount.
9 G + 11.70 = 5 G + 36.50 - 11.70
9 G - 5 G = 36.50 - 11.70
4 G = 24.80
1 G = 24.80 ÷ 4 = 6.20
Total amount that Ken and his sister spent
= 9 G + 5 G + 36.50
= 14 G + 36.50
= 14 x 6.20 + 36.50
= 86.80 + 36.50
= $123.30
Answer(s): $123.30