the cost of diesel fuel varies directly with the number of gallons purchased. if 21 gallons of diesel fuel costs $73.50, how man
y gallons of diesel fuel can be purchased for $98?
2 answers:
73.50÷21=3.5 per gallon
98÷3.5=28 gallons ...answer
The key here is the word "directly." We need to set up a ratio.
gallons / cost = gallons / cost
21 / 73.50 = gallons / 98
Cross multiply and simplify.
(21)(98) = gallons * 73.50
2058 = gallons * 73.50
2058 / 73.50 = gallons
28 = gallons
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