You fill your car with 15 gallons of gas at a cost of $45 using fraction notation how do you write a proportion that shows how much get 5 gallons of gas will cost use X to represent the unknown cost

Question

You fill your car with 15 gallons of gas at a cost of $45 using fraction notation how do you write a proportion that shows how much get 5 gallons of gas will cost use X to represent the unknown cost

Answer 1

The proportion would look like this:

$\frac{15}{45} = \frac{5}{x}$

Where x represents the unknown cost of 5 gallons of gas. To solve for x, we can cross multiply and then divide:

$15x = 5 \times 45$

$15x = 225$

$x = \frac{225}{15} = $ 15

Therefore, 5 gallons of gas will cost $15.