If a given # is $70$% of $X$. How do you determine what $X$ is?

Question

Given I have the number $50,000$ which is $70$% of $X$. How do I calculate what $X$ is without guessing.

Thanks

Answer 1

We have $0.7 * X = 50,000$, so $X = \frac{50,000}{0.7} \approx 71,428.57$.

Answer 2

Since, $70\%=0.70$, you may write $$ 0.70\times X=50,000 $$ and then solve it.

Answer 3

I think it is much more natural to solve such questions without any use of variables. If $50000$ is seventy percent then one percent is $50000/70$, and so one hundred percent is $100\cdot 50000/70$. That's how I learned it in school, years before I had heard about equations and variables. That's how I do it to this day.