Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of the work in 

Find the average of all prime numbers from 1 to 20?

The least value of n, such that (1 + 3 + 3² + ... + 3ⁿ) exceeds 2000, is-

Ram deposited a certain sum of money in a company at 12 % per annum simple interest for 4 years and deposited equal amount in fixed deposit in a bank for 5 years at 15 % per annum simple interest. If the difference in the interest from two sources is ₹ 1350 than the sum deposited in each case is

Directions: The bar graph given below shows the spending of family income on various items and savings during 1993. Observe the graph and answer the following questions:

If the total income of the family during 1993 was ₹ 100000, the savings of the family in 1993 was: 

There are 45 trees in a row. The lemon tree is 20^th from right end. What is the rank of lemon tree from left end?