21.The
H.C.F. of 0.54, 1.8 and 7.2 is:
[A]
1.8
[B]
0.18
[C] 0.018
[D]
18
View Answer With Explanation
22.
sum of two numbers is 216 and their HCF is 27. The numbers are
A.27,
189 B.108, 108
C.154,
162 D.81, 189
23.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. 75 B. 81
C. 85 D. 89
24.
The least number, which when divided by 12, 15, 20 and 54 leaves in each case a
remainder of 8 is:
A.
504 B. 536
C.
544 D. 548
25.The
least number which is a perfect square and is divisible by each of the numbers
16, 20 and 24, is:
[A]
1600
[B]
3600
[C] 6400
[D]
14400
26.Six
bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12
seconds respectively. In 30 minutes, how many times do they toll together ?
A. 4 B. 10
C. 15 D. 16
27.
The product of two numbers is 4107. If the H.C.F. of these numbers is 37, then
the greater number is:
A.
101 B. 107
C.
111 D. 185
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.Find
the highest common factor of 36 and 84.
A. 4 B. 6
C. 12 D. 18
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30.
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Which
of the following fraction is the largest ?
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