Answer:
15
Step-by-step explanation:
4 x __ = 12
the blank would be 3, once you did it on one side you have to do it on the other side too
5 x 3 = 15
Another way you can do it is by...
= 
solve for x (cross multiply)
The ratio is 1:3 because every 3 people 1 is a vegetarian
Answer:
b= -9
( I hope this was helpful) >;D