exam Maths Puzzle Numerical Ability

If a pie has 12 slices, and 1/4 of them are eaten, what percentage of the pie remains?

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exam Other Question

I am trying to find the value of k so that there is no solution

x+3y=K
Kx+y=-1
how do you decide which variablleshould be on the x-axis and which should be on the y-axis