What does "is "mean in math

Question

One of my math questions said 192 is 4/5 of what number. I don't understand. 

Answer 1

In this case, "is" means "equals" (=), as in 192 equals 4/5 of some number.  Let that "some number" be x:

 

192 = (4/5)x

 

Solve for x.