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Ah, remember the days when you just got numbers to work out? Those earlier days were to help you to prepare for these days and beyond because life and math isn’t always so straightforward. It takes some thinking. It takes some maneuvering of facts and figures in order to find a solution to the mathematical problem. Some problems will be rather easy to work through while others - well, they are just brain teasers.
Deweys drove 210 miles
Webers drove 210 - 50 miles = 160 miles
Golds drove 160 + 100 = 260 miles
Stones drove 160 + 110 = 270 miles
Deweys -- 210 miles divided by 20 (mpg) = 10.5 gallons
Webers -- 160 miles divided by 15 (mpg) = 10.7 gallons
Golds -- 260 miles divided by 24 (mpg) = 10.8 gallons
Stones -- 270 miles divided by 30 (mpg) = 9 gallons
Solution: Deweys used 10.5 gallons of gas; Webers used 10.7 gallons of gas; Golds used 10.8 gallons of gas; and Stones used 9 gallons of gas
Answer (b) is the correct answer