exam Maths Puzzle Numerical Ability

Of all failures of a certain of computer hard drive, it is determined that 20% of them only the sector containing the file allocation table is damaged, in 70% of them only nonessen

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The sum of M and N devided by the didderences of M and n I need help if someone could be so kind to help me, my question reads factor each expression 3y^2-21y+18 (factor out GCF first)