book Maths Puzzle Numerical Ability

-21+a=18

2 1/4=b-1 2/3

g-12.56=10.28

-20.5=j-10.65

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book Other Question

2x^2+5x>12

Having trouble with this one. if x varies inversely as y^2, and x=3 when y=24, find x when y=6