book Maths Puzzle Numerical Ability

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logbx^2y^3/z^4

I do not understand how to expand this. Could someone help me.

Thank you

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book Other Question

Solve by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
2x + 3y = 1
5x + 3y = 16 Translates the verbal expression into an algebraic expression.

Eight percent of a number