Respuesta :
Answer:
$17.25
Step-by-step explanation:
1. 12/13.80 = 1.15
2. 1.15 x 15 = 17.25
The cost of 15 gallons of gas is $17.25.
Given that, 12 gallons of gasoline costs 13.80.
We need to find the cost of 15 gallons of gas.
What is the formula for the unitary method?
The formula of the unitary method is to find the value of a single unit and then multiply the value of a single unit by the number of units to get the necessary value.
Now, the cost of 1 gallon of gasoline=13.80/12=1.15
The cost of 15 gallons of gas=15×1.15=17.25
Therefore, the cost of 15 gallons of gas is $17.25.
To learn more about the unitary method visit:
https://brainly.com/question/21648365.
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