The greatest number less than 1500, which is divisible by both 16 and 18, is:

The total cost of 18 pens and 23 pencils is Rs. 231, while the total cost of 7 pens and 13 pencils is Rs. 102. What is the cost of 4 pens and 9 pencils?

How many two-digit numbers are divisible by 3 but not by 7?

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

If ' n ' be any natural number , then by which number ( n⁴-n ) is always divisible ? 

How may digit are required to write numbers from 1 to 50?

Divide 32 into two parts such that the sum of the square of the parts is 674 what is the value of the parts? 

Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case. Then sum of the digits in N is: