Answer:
goes into the box
Step-by-step explanation:
Let the number be
, then

We now use the following property of exponents to simplify the left hand side of the equation.

This implies that;


Since the bases are the same, we equate the exponents to get;

We now multiply both sides by 3 to get;


Therefore the number that goes into the box is 
X = 1/3 yz
3x = yz
y = 3x/z