The value of an article depreciates every year at the rate of 10% of its value. If the present value of the article is  Rs 729, then its worth 3 years ago was

The average salary of all the staff in an office of a corporate house is Rs 5,000. The average salary of the officers is Rs 14,000 and that of the rest is Rs 4,000. If the total number of staff is 500, the number of officers is

How may digit are required to write numbers from 1 to 50?

Four numbers are in the ratio 1 : 2 : 3 : 4 . Their sum is 16. The sum of the first and fourth number is equal to: 

A man wanted to sell an article with 20% profit: but he actually sold at 20% loss for Rs. 480, At what price he wanted to sell it to earn the profit? 

If A’s income is 40 % less than that of B, how much percent B's income is more than that of A? 

A number is doubled and 9 is added. If the resultant is tripled, it becomes 75. What is that number? 

The sum of three consecutive odd natural numbers each divisible by 3 is 63. What is the largest among them?