The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, find the value of x.

माना 1 वस्तु का CP = 1। 20 का CP = 20। x का SP = 20। x का CP = x। लाभ = (SP-CP)/CP * 100 => 25 = (20-x)/x * 100 => 0.25x = 20 - x => 1.25x = 20 => x = 16।