The sum of three consecutive odd numbers is 20 more than the first of these numbers. What is the middle number ?

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Solution

The correct option is B 9
Let the numbers are $x, (x + 2)$ & $(x + 4)$
$\Rightarrow x + x + 2 + x + 4 = x + 20$
$\Rightarrow 2 x = 14 \Rightarrow x = 7$
Middle number $= x + 2 = 7 + 2 = 9$

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