If selling price of an item is 5/3 times its cost price, profit/loss is

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:

10% loss on selling price is what percent loss on cost price?

On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:

A trader sells an article for ₹240, making a loss of 25% on the cost price. What is the cost price of the article?

A person sells a car for ₹20,000, making a profit of 25% on the cost price. What is the cost price of the car?