Quantitative Aptitude - Arithmetic Ability Questions

If a shop keeper marks his goods for a certain amount so as to get 25% gain after allowing a discount of 20%, then his marked price is

Three bottles of equal capacity have mixture of milk and water in ratio 5 : 7, 7 : 9 and 2 : 1 respectively. These three bottles are emptied into a large bottle. What is the percentage of milk in the new mixture?

The number 3521is divided by 8. What is the remainder?

20% discount is offered on an item. By applying a promo code the customer wins 10% cash back. What is the effective discount?

Simplify: (213 x 213 + 187 x 187)

40 men took a dip in a pool 30 m long and 25 m broad. If the average water displaced by a man is 5 cub.m, then what will be the rise (in cm) in level of the pool?

A shopkeeper by selling 21 items earns a profit equal to the selling price of 1 item. What is his profit percentage?

Travelling at 4/5th of his usual speed, a man is 15 minutes late. What is his usual time to cover the same distance?