exam Maths Puzzle Numerical Ability

I am trying to come up with an algebra proportion using X for the problem of solving a MPG question if I have 50 gallons of gas and my car gets 35 MPG

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exam Other Question

John walks the 15 meters from the front door of his house to his moped at
a constant rate of speed. Having forgotten to lock the front door, he runs the 15 meters
back to the fro Use the square root property to solve the equation.
7x^3 - 28 x = 0