book Maths Puzzle Numerical Ability

I dont understand why the 7 in the problem stays 7 in the answer.Why dont you multiply it by 7 making it 49?

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book Other Question

the perimeter of a triangle is 76cm. side A of the triangle istwo times the length of side B. side C is one cm more than side A. what is the lengths of the sides? How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

????