21. The L.C.M. of 2/3, 3/5, 4/7, 9/13 is:
a) 36 b) 1/36
b) 1/1365 d) 12 / 455
22. The H.C.F. of 1.75, 5.6. And 7 is:
a) 0.07 b) 0.7
c) 3.5 d) 0.35
23. The G.C.D. of 1.08, 0.36 and 0.9 is:
a) 0.03 b) 0.9
c) 0.18 d) 0.108
24. The H.C.F of 0.54, 1.8 and 7.2 is:
a) 1.8 b) 0.18
c) 0.018 d) 18
25. The L.C.M. of 3, 2.7 and 0.09 is:
a) 2.7 b) 0.27
c) 0.027 d) 27
26. H.C.F. of 3240, 3600 and a third number is 36 and their L.C.M. is 2⁴ x 3⁵ x 5² x 7² the third number is:
a) 2² x 3⁵ x 7² b) 2⁵ x 5³ x 7²
c) 2⁵ x 5² x 7² d) 2³ x 3⁵ x 7²
27. Three numbers are in the ratio 1: 2: 3 and their H.C.F. Is 12. The numbers are:
a) 4, 8, 12 b) 5, 10, 15
b) 10, 20, 30 d) 12, 24, 36
28. The ratio of two numbers is 3: 4 and their H.C.F. IS 4. Their L.C.M. is:
a) 12 b) 16
c) 24 d) 48
29. The sum of two numbers is 216 and their H.C.F. Is 27. The numbers are:
a) 27, 189 b) 91,189
c) 108,108 d) 154,162
30. The sum of two numbers is 528 and their H.C.F is 3. The number of pairs of numbers satisfying the above conditions is:
a) 4 b) 6
c)8 d)12
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