Answer:
18 gallons
Step-by-step explanation:
To calculate this you just have to calculate a rule of three with both gas tanks, so if the dad´s car holds 12 gallons of gas, and the mom´s car holds 50% more that means 150% of in the rule of three:
[tex]\frac{12}{100}= \frac{x}{150}\\ x=\frac{12*150}{100} \\x=\frac{1800}{100}\\ x=18[/tex]
So the total amount of gallons that the mom´s car tank can hold is 18 gallons.
