Sides of a triangle are 13 cm, 84 cm and 85 cm. Find its area(in square cm)?

If the circumference of a circle increases from 4π to 8π, what change occurs in its area?

The term ‘cabinet' is mentioned in which of the following article of the constitution? 

The following line graph gives the percentage of the number of candidates who qualified an examination out of the total number of candidates who appeared for the examination over a period of seven years from 1994 to 2000.

The total number of candidates qualified in 1999 and 2000 together was 33500 and the number of candidates appeared in 1999 was 26500. What was the number of candidates in 2000?

If U+V=80 and U:V=5:3 then find out the U-V.

Three partners invested Rs. 42000, Rs. 48000 and Rs. 32000 respectively. partnership condition is that, each will the get interest on his capital at the rate of 7 % p. a. and the remaining profit will be divided in the ratio of their capitals. If at the end of the year the total profit is Rs. 32940, then find the share of A in profit. 

Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is:

The sum of two numbers is 84 and their HCF is 12. Total number of such pairs of number is