Let's denote the unknown cost as x. The given information tells us that filling the car with 15 gallons of gas costs $45.
We can set up a proportion using fractional notation to find the cost of 5 gallons of gas:
(15 gallons)/( $45) = (5 gallons)/(x)
To solve for x, we can cross-multiply:
15 * x = 5 * $45
15x = $225
Finally, we solve for x by dividing both sides of the equation by 15:
x = $225 / 15
x = $15
Therefore, 5 gallons of gas will cost $15.
you fill your car with 15 gallons of gas at a cost of $45. using fractional notation how do you write a proportion that shows how much 5 galloons of gas will cost . use x to represent the unknown cost
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