exam Maths Puzzle Numerical Ability

Graph y =-x

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exam Other Question

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? I need help solving problems with equations that contain fractions.

my problem is 1/2(x+12)= 1/3x

can you help me?