Luis bought some pastries. He bought some biscuits with $8.60 more than half his money. He then bought some shortbreads with $1.10 less than half of his remaining money. He then had $9.40 left. How much did he pay for the biscuits?
| Biscuits |
Remaining amount |
| 1 u + $8.60 |
1 u - $8.60 |
| |
Shortbreads |
Left |
| |
1 p - $1.10 |
1 p + $1.10 |
| |
|
$9.40 |
Working backwards.
Amount that Luis had left = 1 p + 1.10
1 p + 1.10 = 9.40
1 p = 9.40 - 1.10 = 8.30
Remaining amount after he bought some biscuits
= 2 p
= 2 x 8.30
= $16.60
Remaining amount after he bought some biscuits = 1 u - 8.60
1 u - 8.60 = 16.60
1 u = 16.60 + 8.60
1 u = 25.20
Amount that Luis spent on some biscuits
= 1 u + 8.60
= 25.20 + 8.60
= $33.80
Answer(s): $33.80
