The tank of John's car is full: it contains 47 liters of gasoline. After a journey of 275 km, there are 14 liters left. What is the fuel consumption of this car per 100 km?
How many liters of gasoline did the car consume? ** The car consumed 47 liters - 14 liters = <<47-14=33>>33 liters of gasoline for 275 km.
Define a variable ** Let x be the fuel consumption per 100 km. We can write the proportion: 33/275 = x/100
Write an equation ** The cross product gives: 275 x = 33 * 100
What is the fuel consumption of this car per 100 km? ** So the car consumes x = 3300/275 = <<3300/275=12>>12 liters per 100 km.
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