Final answer:
Mrs. Hillery's tank holds 120 gallons of gas.
Step-by-step explanation:
To find out how many gallons of gas Mrs. Hillery's tank holds, we can set up a proportion using the information given. Let's represent the number of gallons her tank holds as 'x'. The proportion would look like this:
1/8 = 15/x
We can cross multiply and solve for x:
1 * x = 8 * 15
x = 120
Therefore, Mrs. Hillery's tank holds 120 gallons of gas. The correct answer is A) 40 gallons.