Direction: The following diagram shows the percentage of population of Hindus, Sikhs and Muslims with respect to total population in a town during 2005 to 2008. Study the diagram and answer the questions:

If the total population in 2007 was 80 lakh, then the number of Hindus n 2007 was (in lakh) 

Pranav rows upstream a distance of 56km in 8 hours and rows downstream a distance of 75 km in 3 hours. How much time he will take to row a distance of 44.8 km in still water?

The principal which gives ₹ 1 interest per day at a rate of 5 % simple interest per annum is 

Which of the two numbers should be reduced in the ratio of 15:19 so that the ratio becomes 3: 4?

If x - y = 6 and xy = 40, then  find $$ {x^2+y^2}$$

There is 80% increase in amount in 5 years at simple interest. What will be the compound interest of Rs. 20,000 after 3 years at the same rate?

Find the exact value of the following question:

$$ 8\sqrt{?}÷14×3+9=21$$

Find the greatest perfect square number of 5 digits.