Question

If the sum of successor and predecessor of a number is 14, then the number should be _____.

• A. 6
• B. 8
• C. 7
• D. 10

Answer 1

The correct option is C 7

Let the number be $x$.
Therefore, the successor of number is $x$ + 1 and the predecessor is $x$ - 1.
Given that the sum of successor and predecessor is 14.
$\therefore x+1+x-1=14\Rightarrow 2x=14\Rightarrow x=\frac{14}{2}\Rightarrow x=7$
So, the number should be 7.