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On a long road trip, a family used 12 gallons of gas. At the end of the trip, there were 3 gallons left in the tank. How many gallons of gas were in the tank at the start of the trip?

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puppies22
hi!
So during the whole trip, they used 12 gallons and then at the end had 3 leftover. So just add those 2 together and you gets 15 gallons.
15 - 12 = 3 
12 + 3 = 15
they started with 15 gallons!
Hope this helps!
MrRoyal

The amount of gas used and the amount of gas left are illustrations of arithmetic operations.

15 gallons were in the tank at the start of the trip

The given parameters are:

[tex]\mathbf{Used = 12\ gallon}[/tex]

[tex]\mathbf{End = 3\ gallon}[/tex]

The required equation is:

[tex]\mathbf{Beginning = Used + End }[/tex]

Substitute known values

[tex]\mathbf{Beginning = 12\ gallons + 3\ gallons}[/tex]

Evaluate like terms

[tex]\mathbf{Beginning = 15\ gallons}[/tex]

Hence, 15 gallons were in the tank at the start of the trip

Read more about arithmetic operations at:

https://brainly.com/question/15385899