Question

$\left(+27\right)+\_\_\_\_\_\_\left(-7\right)=-17$

Answer 1

Let the number $x$ will be in the blank space,

so,

$$\begin{gathered} \left(+27\right)+\_\_\_\_\_\_+\left(-7\right)=-17 \\ \Rightarrow \left(+27\right)+x+(-7)=-17 \\ \Rightarrow 20+x=-17 \\ \Rightarrow x=-17-20 \\ \Rightarrow x=-37 \end{gathered}$$

Hence, the number $\left(-37\right)$ is the required answer.