Question

Three consecutive numbers whose sum is $12$are _________, _________ and _________.

Answer 1

Let us assume the first number will be $x$
Therefore the other two will be $x+1,x+2$
According to question:
$$\begin{gathered} x+x+1+x+2=12 \\ \Rightarrow 3x+3=12 \\ \Rightarrow 3x=9 \\ \Rightarrow x=3 \end{gathered}$$

Therefore,
The first number is $3$
The second number is $x+1=3+1=4$
The third number is $x+2=3+2=5$
Hence, $3,4and5$ are consecutive numbers and their sum is $12$