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?

A. 15
B. 16
C. 18
D. 25Explanation: Let C.P. of each article be Re. 1 C.P. of x articles = Rs. x.
S.P. of x articles = Rs. 20.
Profit = Rs. (20 – x).
(20-x)/x * x = 25
2000 – 100x = 25x
125x = 2000
x = 16.