book Maths Puzzle Numerical Ability

log(10x/y)=1+log x-log y. I have no idea whether this problem is true or false. Could you please help show me the steps in finding the answer?

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book Other Question

add or subtract,simplify if possible and show steps to answer

16+X/x^3 + 7-4X/X^3
How would u solve X^ 2 + 8 ^ 2 = 0