book Maths Puzzle Numerical Ability

simplify this problem
6x^2-54
________=
4x^2-36

thanx

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book Other Question

two circles each of radius 5cms intersect each other. if the distance between their centres is 5 root 2 cms, find the area of the portion common to the two circles. How long does it take to travel 4/10 of a mile at 45mph