Maths 4

If a and b be positive integers such that $$a^2-b^2 = 19$$, then the value of a is

If the ratio of cost price and selling price of an article be as 10:11, the percentage of profit is

A manufacturer marked an article at Rs. 50 and sold it allowing 20% discount. If his profit was 25%, then the cost price of the article was

A shopkeeper earns a profit of 12% on selling a book at 10% discount on the printed price. The ratio of the cost price and the printed price of the book is

By selling a bicycle for Rs. 2,850, a shopkeeper gains 14%. If the profit is reduced to 8%, then the selling price will be