A, B, C and D purchase a gift worth Rs. 60. A pays $${1\over2} $$ of what others are paying. B pays $${1\over 3} $$ of  what others are paying and C  pays $${1\over 4} $$ of what others are  paying. What is the amount paid by D?

The difference of a number consisting of two digits from the number formed by inter changing the digits is always divisible by: 

The total number of integers between 100 and 200, which are divisible by both 9 and 6, is 

The least number, which must be added to 6709 to make it exactly divisible by 9, is 

In a two digit number if it is known that its unit digit exceeds its tens digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is 

0.1 and   $${5\over 8}$$ of a bamboo are in mud and water respectively and the rest of length 2.75 m is above water. What is the length of the bamboo? 

4⁶¹ + 4⁶² + 4⁶³ + 4⁶⁴ is divisible by: 

Find the no. of prime factors in the product of 25¹² × 10⁷ x 14⁷ ?