Quantitative Aptitude - Arithmetic Ability Questions

A wooden bowl is in shape of a hollow hemisphere of internal radius 7 cm and thickness 1 cm. What is the total surface area (in sq.cm) of the bowl? (Take:  = 22/7)

The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

The average cost of 4 items in a shopping list is Rs 1,250. If one more item whose cost is Rs 2,000 is added to the list what will be the new average (in
Rs)?

What is the value of 53% of 7400?

The marked price of an article is Rs 2400. It is sold at two successive discounts of 10% and 15%. What is the selling price (in Rs) of the article?

Find the circumference (in cm) of a circle of radius 10.5 cm

The area of a square is 40.5 cm². Find the length of its diagonal (in cm).

The sum of a number and 4 times its reciprocal is 5. What is the number?