exam Maths Puzzle Numerical Ability

Determine which two equations represent parallel lines.(a) y = x + 4 (b) y = x - 7 (c) y = 2x + 8 (d) y = 2x - 4

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A square piece of cardboard is formed into an open box (not top) by removing a 1.5 inch square from each corner and folding up the sides. If the volume of the box is 37.5 cubic inches, what was the size of the cardboard? In order to full a water tank three pipes producing 12L/min, 16L/min, 20L/min of water are turned on at 30 min intervals. If they are turned on in the order given, how long after the first pipe is turned on will a 1200 L tank be filled?