An exterior angle of a regular polygon is 72^o. The sum of all the interior angles is -

A man bought a chair for ₹580. At what price should he sell the chair so as to gain 25%?

A man had a certain amount with him. He spent 20% of that to buy an article and 5% of the remaining on transport. Then he gifted ₹ 120. If he is left with ₹ 1,400, the amount he spent on transport is: 

A clock showing the time of 8 o'clock in the morning. How many degrees will the hour needle rotate in the clock by 2 pm?

There are 2 to 40 minutes on any watch. So how many degree angles will be made between the two needles?

If Jhanavi borrowed Rs.1,25,000 at 8% compounded, what will be the amount to be paid back at the end of 2 years? 

Simplify the following equation.
$${(785.785.785+435.435.435) \over(785)^{2}+(435)^{2}-(785)(435)}$$

Directions :- Read the given information carefully and answer the following questions.

There are four hostels i.e. A, B, C and D.

In hostel A: Number of boys are 120 and number of girls are 30% more than that of number of girls in

hostel B.

In hostel B: Number of boys are double than that of number of girls.

In hostel C: Number of boys are 100 more than that of boys in hostel A and total boys and girls in C is 1000.

In hostel D: Number of boys is 182 more than the number of boys in hostel A. Average of number of girls of hostel A and that of hostel D is 223.Number of boys in hostel D is 98 less that of boys in hostel B.

Find ratio of total number of boys and girls together in hostel B to that of in hostel C?