The table shows the charge for water services provided by the utilities board.
Water consumption |
Rate |
70 m3 of water usage and below |
$1.70 per m3 |
Additional water usage above 70 m3 |
$2.20 per m3 |
Gwen's family paid $141 for water usage in the month of September. What is the most amount of water that they could have used in September?
Amount that Gwen's family paid for the first 70 m
3 of water usage
= 70 x 1.70
= $119
Remaining amount that Gwen's family paid for additional water usage
= 141 - 119
= $22
Additional water usage
that Gwen's family paid for
= 22 ÷ 2.20
= 10 m
3Most amount of water that Gwen's family could have used in September
= 70 + 10
= 80 m
3 Answer(s): 80 m
3