Question

There is not question just complete the blank space missing number

Answer 1

To solve this problem we need to find a conversion factor between the columns of data.

We can see that in the middle row, -31 becomes 155: there was a multiplication by -5, because

$-31(-5)=155$

Also in the last row, 90 becomes -45: there was also a multiplication by -5, because

$90(-5)=-450$

So we can see that the conversion factor between the middle column the right column is -5:

So we have to do this in the first row, the missing number has to be such that when we multiply it by (-5) it results in 545.

The opposite is also true: the missing number is the result of dividing 545 by -5:

$\frac{545}{-5}=-109$

Answer: -109