The third proportional of two numbers 9 and  24 is

Find the standard deviation of the following data (rounded off to two decimal places). 5, 3, 4, 7 

Train A takes 1 hour more than train B to travel a distance of 720 km. Due to engine trouble speed of train B falls by one third, so it takes 3 hours more than Train A to complete the same journey. What is the speed of Train A (in km/hr)?

3x² = 36 then what is the value of x?

Ram started a business by investing Rs.48000. After 7 months, Sita joined him with a capital of Rs.56000. At the end of the year of the total profit was Rs.5885. What is the Sita share of the profit?

A person lent Rs. 8000 partly at the rate of 5% and partly at the rate of 6% per annum simple interest. The total interest after 2 years is Rs. 820 then in which ratio will Rs. 8000 is to be divided?

Directions: The bar graph given below shows the production (in ' 000 tones) of rice of a country for the year 2007 to 2011. Study the graph carefully and answer the question given below it.

The production of rice in the year 2010 is how much percent more than the production of rice in the year 2009? 

The ratio of the income of A to that of B is 5 : 7. A and B save Rs.4,000 and Rs.5,000 respectively. If the expenditure of A is equal to $$ {66 {2\over 3}}{\%}$$ of the expenditure of B, then the total income of A and B is: