book Maths Puzzle Numerical Ability

I need help please! The question I have is:

The sum of three consecutive odd integers = 171

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book Other Question

The sun of two numbers is 64. Twice the lesser number is five more that the greater number. Find the numbers. An (n,k,d) code with generator matrix G=[I|A], where A is a k x (n-k) matrix, is MDS (Maximum distance separable) if and only if every square submatrix (formed from any i rows and