Question

When $5$ is added to a number, we get $15$. How do we represent this in the form of an equation?

Answer 1

Let us take the number to be $x$.
When $5$ is added to the number, we get $x+5$.$\left[1mark\right]$
Now, we know that when $5$ is added to that number, we get $15$.
Hence, $x+5=15$.$\left[1mark\right]$