If radius of a sphere is decreased by 48%, then by what percent does its surface area decrease?

If secθ + tanθ = 3, then the value of secθ is:

Amar can do a piece of work in 30 days and Raman can do the same work in 15 days. If both work together, then what percent of the total work will be completed in 4 days?

Find the average of the cubes of the first five natural numbers. 

While selling an article, a shopkeeper gives a discount of 5%. If he gives a discount of 7%, he earns Rs.15 less as profit. The marked price of the article is -

A dealer sells an article for ₹ 24 and gains as much percent as the price of the article , then the cost price of the article is: 

A man purchased 7 bags of rice at the rate of  ₹ 800 each, 8 bags of rice at ₹ 1000  each and 5 bags of rice at the rate of  ₹ 1200 each. What is the average cost of one bag of rice?

A started a business with a certain capital. After 3 months A left the business and B joins the business and remains in business. If the ratio of the profit at the end of the year is 5: 6 and the initial investment of A is Rs. 6000, then the investment of B is