The average of four consecutive odd numbers is 36. What is the smallest of these numbers?

A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years.:

Directions: The following graph gives Sales, Expense and Capital of a company for a period of five years 1994 to 1998. Read the graph and answer the following questions.

In which year was the Sales to Expense ratio the lowest?

The sum of the squares of 2 number is 146 and the square root of one of them is 5. The cube of the other number is 

The angle of elevation of the top of a tower from the point P and Q at distance of 'a' and 'b' respectively from the base of the tower and in the same straight line with it are complementary . The height of the tower is 

If the height of a given cone be doubled and radius of base remains the same, the ratio of the volume of the given cone to that the second cone will be -

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

In how many ways can letter of the word MAILINGS arrange so that M and N always come together?