9514 1404 393
Answer:
32 gallons
Step-by-step explanation:
There are a couple of ways you can go at this. First of all, you can verify that gallons are proportional to miles.
The ratio of miles to gallons in each case is 30:
600/20 = 450/15 = 300/10 = 30
This tells you that the ratio of interest is ...
960/x = 30
960/30 = x = 32
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The number 960 is the sum ...
960 = 600 + 300 + (600/10)
So, we expect the number of gallons to have a similar formula.
gallons for 960 = (gallons for 600) +(gallons for 300) +(1/10)(gallons for 600)
gallons for 960 = 20 +10 +2
gallons for 960 miles = x = 32
