# The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is: Option 1) 15Option 2) 16Option 3) 18Option 4) 20Option 5) 25

P % = $\dpi{100} \left ( \frac{dif\! f}{SP} \right )\times 100$
$\dpi{100} 25=\left ( \frac{(20-x)}{x} \right )\times 100$
$\dpi{100} x=16$