book Maths Puzzle Numerical Ability

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The intensity level of an earthquake is based on the Richter scale. Using logarithms, the Richter scale me

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a^2m * b^m+1 over a^m *b i need to simplify this. i know a^2m simlifies to a^m but i dont know what b^m+1 over b would simlify to? USING A COMBINATION OF 24% NITROGEN AND 12% NITROGEN TO ACHIEVE AN END RESULT OF 100 GRAMS OF 21% NITROGEN.