If the volumes of two cubes are in the ratio 27 : 64 and then the ratio of their total surface area is 

A bag contains Rs.90 in coins of denominations of 50 paise, 25 paise and 10 paise. If coins of 50 paise, 25 paise and 10 paise are in ratio 2 : 3 : 5, then the number of 25 paise coins in the bag is 

The sum of the present ages of Varun and Kapil is 42 years. The ratio of their ages after 5 Years will be 15 : 11. What is the present age of Kapil? 

The average of five numbers is  27.  If one  number is excluded. The average becomes 25. The excluded number is

The greatest number which when divided by 989 and 1327 leaves remainder 5 and 7 respectively is

simplify the following equation
$$ (1-{1\over3})(1-{1\over4})(1-{1\over5})......(1-{1\over n})$$

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

Simplify the following equation.
$$ {(100)}^{1\over2}.{(0.001)}^{1\over3}-{(0.0016)}^{1\over4}.{3}^{0}+({5\over4})^{-1} $$