Quantitative Aptitude - Arithmetic Ability Questions

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

25% discount is offered on an item. By applying a promo code the customer wins 22% cash back. What is the effective discount?

A person while buying a dress on sale spends Rs. 45 and saves Rs. 5, what is the percentage of his savings?

Suresh goes on a trip on his motor-cycle and rides for 410 kms. If he rides for 5 hours at a speed of 50 km/hr, find at what speed he travels for the remaining 4 hours of the journey?

The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years the ratio of their ages will be 10:9. What is Ratna's present age?

A starts a cement trading business by investing Rs 5 lakhs. After 2 months, B joins the business by investing Rs 10 lakhs and then 4 months after B joined C too joins them by investing Rs 20 lakhs. 1 year after A started the business they make Rs 3,50,000 in profit. What is B's share of the profit (in Rs)?

If the compound interest for the 3rd and 4th year on a certain principal is Rs 125 and Rs 135 respectively, what is the rate of interest (in %)?

The marked price of an article is Rs 960 and it is sold at a discount of Rs 192. What is the discount percentage?