book Maths Puzzle Numerical Ability

solve y
2log(3,y) + log(3,0.1) = log(3,5) + log(3,2)

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5) Logarithms:
a) Using a calculator, find log 1000 where log means log to the base of 10.
Answer:

b) Most calculators have 2 different log how do you simplify the expression (7a^-5b^-6)/(21a^4b^-2)