book Maths Puzzle Numerical Ability

martin has $5.50 in nickels and dimes in his piggy bank. if there are 20 more nickels than dimes, how many nickels does martin have in his piggy bank.

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book Other Question
Use the properties of Logarithms to evaluate:
Log sub3 9+Log sub3 36-log sub3 4. Add or subtract as indicated:

4/a-5 - 1/5-a

Thanks for any help given!