exam Maths Puzzle Numerical Ability

Write log b 81 = 2 in exponential form.

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How many ounces of pure gold must be added to five ounces of something that is 1 percent gold in order that the mixture is 6 percent gold? My problem is; Kristi jogged for 3/5 of an hour, swam for 1/2 of an hour, and rode her bicycle for 3/4 of an hour. How long did she exercise?