25*4*х=900

To solve the equation \( 25 \cdot 4 \cdot x = 900 \), start by simplifying the left side:

1. Calculate \( 25 \cdot 4 = 100 \).
2. Now, rewrite the equation:
   \( 100 \cdot x = 900 \).

Next, divide both sides by 100 to isolate \( x \):

\[ x = \frac{900}{100} = 9 \]

So, the solution is \( x = 9 \).