Let us analyze question 5.

To simplify, we can represent the empty box with an alphabet. let us say y for example to that we will have
step 1:

Next, we will simplify the expression on the left -hand side by dividing

Simplifying further

This means that the value of the left-hand side of the equation is

step 2: Hence, we can equate to the right-hand side

Cross multiplying

Dividing both sides by 9

Question 6

Thus the missing part is
