exam Maths Puzzle Numerical Ability

Three times the larger of two numbers is equal to four times the smaller. The sum of the numbers is 21. Find the numbers

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exam Other Question

Please help. How do I do this?
Write x^12 as a power of x^2. Factor completely: m^3-9m^2n+18n^2m
If anyone could help I would appricate it, I came up with m(m^2-9mn+18n^2) but it doesnt look right for some reason.