The cost price of 20 articles is the same as the selling price of x articles.The value of x is
Let C.P. of each article be Rs. 1
=> C.P. of x articles = Rs.x.
S.P. of x articles = Rs. 20.
Profit = Rs. (20 - x).
20−xx×100 = 25.
2000 - 100x = 25x.
125x = 2000.
⇒ x = 16.