Q11. Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is :
A. 85
B. 89
C. 81
D. 75
Q12. The H.C.F. and L.C.M. of two numbers are 11 and 385 respectively. If one number lies between 75 and 125, then that number is :
A. 110
B. 99
C. 88
D. 77
Q13. The L.C.M. of 22, 54, 108, 135 and 198 is :
A. 5940
B. 330
C. 1980
D. 11880
Q14. The sum of two numbers is 528 and their H.C.F. is 33. The number of pairs of numbers satisfying the above conditions is :
A. 8
B. 4
C. 6
D. 12
Q15. The H.C.F. of two numbers is 11 and their L.C.M. is 7700. If one of the numbers is 275, then the other is :
A. 318
B. 308
C. 283
D. 279
Q16. Product of two co – prime numbers is 117. Their L.C.M. should be :
A. 117
B. 110
C. 122
D. 1
Q17. If the sum of two numbers is 55 and the H.C.F. and L.C.M. of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is equal to :
A. 120/11
B. 55/601
C. 11/120
D. 601/55
Q18. Three numbers are in the ratio 1 : 2 : 3 and their H.C.F. is 12. The numbers are :
A. 4, 8, 12
B. 12, 24, 36
C. 10, 20, 30
D. 5, 10, 15
Q19. The L.C.M. of two numbers is 48. The numbers are in the ratio 2 : 3. The sum of the numbers is :
A. 40
B. 28
C. 64
D. 32
Q20. The product of two numbers is 2028 and their H.C.F. is 13. The number of such pairs is :
A. 2
B. 1
C. 4
D. 3