PSLE At a sale, Ethan bought 8 glasses of the same kind. His aunt bought 4 such glasses. She also bought 3 mugs at $6.60 each. Altogether, she spent $13.80 less than Ethan. What was the total amount of money Ethan and his aunt spent?
|
Ethan |
His aunt |
Items bought
|
8 glasses
|
4 glasses + 3 mugs = 4 glasses + 19.80 |
Comparing the amounts paid |
$13.80 more |
|
Amount that his aunt spent on 3 mugs
= 3 x 6.60
= $19.80
Let the cost of 1 glass be 1 G.
If Ethan spent $13.80 less, each would pay the same amount.
8 G - 13.80 = 4 G + 19.80
8 G - 4 G = 19.80 + 13.80
8 G - 4 G = 33.60
4 G = 33.60
1 G = 33.60 ÷ 4 = 8.40
Total amount that Ethan and his aunt spent
= 8 G + 4 G + 19.80
= 12 G + 19.80
= 12 x 8.40 + 19.80
= 100.80 + 19.80
= $120.60
Answer(s): $120.60