exam Maths Puzzle Numerical Ability

2x + y - 3z=1
3x - y + 4z=6
x + 2y -z=9

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exam Other Question

Log(3x^2+2x+2)=0.84509 Find the multiplicative inverse of 2.25

ok..I get that multiplicative inverse of 7 is 1/7 and 2/3 is 3/2...but I do not for some reasom get the the multiplicative inverse of 2.25!!!! Please explain thanks