During a 250-mile trip a car uses fuel at a rate of 20 miles per gallon. At the start of the trip, $16 of fuel was pumped into the 15-gallon tank bringing the tank from a level of exactly Y4 full to exactly full. What is the cost of fuel for the trip?
Let x equal what you are trying to find x ($ I trip)
Reciprocal factors
250 (mi / trip) 20 (mi / gal)
16 ($ / purchase)
3 / 4 (tank / purchase) 15 (gal / tank) 1 / 250 (trip / mi) 1 / 20 (gal / mi)
1/ 16 (purchase / $)
4 / 3 (purchase / tank)
1 / 15 (tank / gal)
Build an equation
x ($ / trip) = 16 ($ / piffehase)* 4 / 3 (purchase / tank) * 1 / 15 (tank / gal) *1 / 20 (gal / fni) * 250 (tni / trip)
Multiply factors
x ($ / trip) = 17.78 ($ / trip)
Cost of trip is $17.78.
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