book Maths Puzzle Numerical Ability

Hi there!

I have asked this question a few times today, but no response. Could someone please help me solve this problem before I go nuts!
I am having trouble finding the LCD(n

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How much of an alloy which contains 6 grams of gold in 10 grams must be melted with another alloy which contains 3 grams of gold in 10 grams, to give an alloy containing 5 grams of i need to classify the polynomial function by number of terms and by degree

n=5m^2-3m^3