exam Maths Puzzle Numerical Ability

3x^2-6x x^2-x-6
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x^2-6x+9 x^2-4

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exam Other Question

Write the equation of the line passing through (3, -1) and (3, 6). A 2000L tank containing 550L of water is being filled with water at the rate of 75L per minute from a full 1600L tank. How long will it be before the two tanks have the same amount of water?