The table shows the charge for water services provided by the utilities board.
Water consumption |
Rate |
70 m3 of water usage and below |
$1.80 per m3 |
Additional water usage above 70 m3 |
$1.90 per m3 |
Tammy's family paid $145 for water usage in the month of November. What is the most amount of water that they could have used in November?
Amount that Tammy's family paid for the first 70 m
3 of water usage
= 70 x 1.80
= $126
Remaining amount that Tammy's family paid for additional water usage
= 145 - 126
= $19
Additional water usage
that Tammy's family paid for
= 19 ÷ 1.90
= 10 m
3Most amount of water that Tammy's family could have used in November
= 70 + 10
= 80 m
3 Answer(s): 80 m
3