book Maths Puzzle Numerical Ability

I need help.

How do you evaluate the following

log base is 12 554?

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book Other Question

Could you show me an algebraic inequation in it's simplest form for the following:

I can purchase 250g of mild cheese for $3.00 or 250g of mature cheese for $3.50. What possible Jane and Fred live 4 miles apart. Jane travels at a rate of 2mi/h and Fred at a rate of 3 mi/h. How long will it be before they meet?