exam Maths Puzzle Numerical Ability

Perform the indicated oeprations. Write fractional answers as mixed numbers or as proepr fractions reduced to lowest terms.

21 7/8 + 3 3/4 =

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Please help me
the question says use the Laws of Logarithms to rewrite the expression form with no logarithm of a product, quotient, or power.

the problem is log(x/3square root of 1-x) (x^-1 - y^-1)^-1