book Maths Puzzle Numerical Ability

what are the x and y coordinates of y=-1
thanks!

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book Other Question

how many pints of a 40% salt solution must be added to 12 pints of 20% salt solution to end up with a 32% salt solution the time(t) required to empty a tank varies inverse as the rate(r) of pumping. A pump can empty a tank at the rate of 1200 L/min how will it take the pump to empty the tank at 3000L?
it will take____minutes to empty the tank.