exam Maths Puzzle Numerical Ability

5a
--- = 75
2

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I have a question. I am supposed to find the GCF of each product.

(6y^2 - 3y) (y + 7)

I got 3y (3y + 7) when I worked it out but I am not showing a GCF could you please help me with this problem? Thanks It is found that a story book containing 200 pages contained on an average 2 spelling mistakes in every 10 pages. What is the probability that in the next 25 pages of the book that