Correct Answer - Option 3 : 16

**Given:**

CP of 20 articles = SP of x articles

Profit = 25%

**Formula Used:**

%Profit = [(SP – CP)/CP] × 100

Calculation:

Let the CP of each article be a

And the SP of each article be b

So, the CP of 20 articles = 20a

Also, the SP of x articles = bx

According to the question,

20a = bx ----(i)

Now, the equation for profit percentage becomes:

25 = [(b – a)/a] × 100

⇒ b = 1.25a ----(ii)

On substituting the value of equation (ii) into equation (i), we get:

20a = 1.25a × x

⇒ x = 16

**∴ The required value of x is 16**