400÷х=1000÷10

To solve the equation \( \frac{400}{x} = \frac{1000}{10} \), we first simplify the right side: \[ \frac{1000}{10} = 100 \] Now, we rewrite the equation: \[ \frac{400}{x} = 100 \] Next, we can cross-multiply: \[ 400 = 100x \] Now, divide both sides by 100 to solve for \( x \): \[ x = \frac{400}{100} = 4 \] Thus, the solution is: \[ x = 4 \]