The unknown number is X;
x/6+2=9;
X/6=7;
X=42;
The answer is 42
First, you put the triangles in a ratio
Then, you ask yourself "what do I have to divide seven by to get 5" so you do 7.5/5 to get that answer (which is to divided by 1.5)
Then, on the other side, you divide 22.5 by 1.5 as well
Answer:
B. 4√3
Step-by-step explanation:

Consider this option (basic steps are marked).