For the following questions answer them individually
If the surface area of two spheres in the ratio 81 : 25, then what is the ratio of their radius.
The difference between compound interest and simple interest on a sum of Rs. 16,000 for two years is Rs. 160. Find the per annum rate of interest.
What is the value of $$28 \times 25 \div 7 \times 15 + 63 \times 56 \div 72 \times 5 + 24 \times 7 + 8$$?
A bus covers a distance of 45 km in 45 minutes. If its speed is decreased by 20 km/hr, then what will be the time taken by it to cover the same distance?
A man earns a profit of 45 percent by selling a bike for a certain price. If he sells that bike at double the price. then what will be the profit percentage?
A man takes 6 hours to go to a place and come back by walking both the ways. He could have saved 2 hours by riding both the ways. The distance covered in the whole journey is 20 miles. What is the average speed for the whole journey if he goes by walking and comes back by riding?
Jaya invested Rs. 14800 at 8.5% per annum on simple interest. The interest earned after 6 months is:
The table given below shows the marked price and the value of discount of five different articles.
Selling price = Marked price - Discount
L1 = The value of average of discount of article C and D.
L1 = Sum of the selling price of all article.
What is the value of (L1 + L2)?
Marked price of a computer is Rs. 10000. Selling price of computer is Rs. 7650. If two successive discounts of 15 percent and x percent are given, then what is the value of x?