The sum of two numbers is 45. Their difference is $\frac{1}{9}$ of their sum. Their L.C.M is
1). 200
2). 250
3). 100
4). 150
3. The product of two numbers is 2028 and their HCF is 13. The number of such pairs is
5. The greatest number that will divide 729 and 901 leaving remainders 9 and 5 respectively, is
6. The H.C.F. of two numbers is 8. Which one of the following can never be their L.C.M.
8. The sum of two numbers is 216 and their HCF is 27. How many pairs of such numbers are there