ANSWER
50
EXPLANATION
We want to know how many thousands there are in 50,000
To do this, we have to find what we will multiply by 1000 to get 50,000
That is:
[tex]\begin{gathered} x\cdot\text{ 1000 = 50000} \\ \Rightarrow\text{ x = }\frac{50000}{1000} \\ x\text{ = 50} \end{gathered}[/tex]The answer is 50.