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You would call your local water company to find out the amount. Cost is usually based on the amount of water you use each month.
$14250 ÷ $20 = 712 r 1 You could use at most 712 of the $20 bills and at least 2 of the $5 bills, You can reduce the number of $20 bills and for each one you reduce it by, you need to increase the number of $5 bills by 4, eg 711 of the $20 bills and 6 of the $5 bills. You could use no $20 bills at all in which case you would need to use 2850 of the $5 bills.
The basics come into use quite often, though you might not even realise you are using algebra.
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