hence 7 gallon will cost is 7*2.5=17.5.
what is cost?
Cost of product for which one bears it to have any product is said it's cost.That is an amount that has to be paid or spent to buy or obtain something.
how to calculate?
given cost of 6 gallon of gas=$15
hence 1 gallon=15/6=2.5
hence 7 gallon will cost=7*2.5=17.5
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