The table shows the charge for water services provided by the utilities board.
Water consumption |
Rate |
20 m3 of water usage and below |
$1.40 per m3 |
Additional water usage above 20 m3 |
$1.50 per m3 |
Risa's family paid $37 for water usage in the month of September. What is the most amount of water that they could have used in September?
Amount that Risa's family paid for the first 20 m
3 of water usage
= 20 x 1.40
= $28
Remaining amount that Risa's family paid for additional water usage
= 37 - 28
= $9
Additional water usage
that Risa's family paid for
= 9 ÷ 1.50
= 6 m
3Most amount of water that Risa's family could have used in September
= 20 + 6
= 26 m
3 Answer(s): 26 m
3