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Chapter 7   

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Trip to the Lake
solution

The Deweys used 10.5 gallons of gas.
The Webers used 10.7 gallons of gas.
The Golds used 10.8 gallons of gas.
The Stones used 9 gallons of gas.

explanation

  Deweys Webers Golds Stones
Miles per gallon 20 15 24 30
Find the miles driven. 210 210
–  50
160
  160
+100
  260
  160
+110
  270
Find the number of gallons used by dividing the miles driven by the miles per gallon. 210
20
160
15
260
24
270
30
Gallons used 10.5 10.6666 10.83 9
Gallons used
(to nearest 0.1)
10.5 10.7 10.8 9

 


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