book Maths Puzzle Numerical Ability

express the logarithm in terms of log2 M and log2 N: log2 (M/N)^4

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book Other Question

A mother is 41 years old and her daughter is 9 years old. In how many years will the mother be 3 times as old as the daughter? I have tried everything i know to solve this problem but i cannot answer the problem correctly please help :
8f-3(f+6)=2f-16