exam Maths Puzzle Numerical Ability

Solve the system by addition.

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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? The parametric equations x=-5t-3,y=5t+4,t in R, specify the position of a moving point P(x, y) at time t. Select the proper alternatives to describe the behavior of the point as t