book Maths Puzzle Numerical Ability

three hundred miles were traveled at a rate of 60 mph. how much time did the jet fly.

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The gasoline gauge shows that the gasoline tank is 1/3 full. In order to fill the tank, 16 gallons of gasoline are added. How many gallons of gasoline does the tank hold when full? 2x-3y+5z=-5, 2y-3z=4, and 4z=-8