book Maths Puzzle Numerical Ability

-b^2-b+7b+2b^2-6b

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book Other Question

William is 1/6 as old as his father but 5 years older than his sister, Mary. If the sum of all their ages is 51, how old is William?

(not from a text) Thank You for your help.
I previously today asked the question

How many three letter words can be formed using the word: MANAGEMENT? Where the words do not have to be real words, just any three letters