21.
The H.C.F. of 1.75, 5.6 and 7 is:
• A.
0.07
• C.
3.5
• B.
0.7
• D.
0.35
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Explanation :

Given numbers with two decimal places are : 1.75, 5.60 and 7.00. Without decimal places, these numbers are : 175, 560 and 700, whose H.C.F. is 35.

 H.C.F of given numbers = 0.35

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22.
The H.C.F. of 22 x 33 x 55, 23 x 32 x 52 x 7 and 24 x 3 4 x 5 x 72 x 11 is :
• A.
22 x 32 x 5
• C.
24 x 34 x 55
• B.
22 x 32 x 5 x 7 x 11
• D.
24 x 34 x 5 5 x 7 x 11
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Explanation :
 H.C.F. = Product of lowest powers of common factors = 22 x 32 x 5
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23.
A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting point?
• A.
26 minutes 18 seconds
• C.
45 minutes
• B.
42 minutes 36 seconds
• D.
46 minutes 12 seconds
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Explanation :
 L.C.M. of 252, 308 and 198 = 2772. So, A, B and C will again meet at the starting point in 2772 see i.e., 46 min. 12 sec
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24.
 The L.C.M. of 1 , 5 , 2 , 4 is: 3 6 9 27
•  A. 1 54
•  C. 20 3
•  B. 10 27
•  D. None of these
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Explanation :

 Required L.C.M. = L.C.M. of 1,5,2,4 = 20 H.C.F. of 3,6,9,27 3

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25.
The largest four � digit number which when divided by 4, 7 or 13 leaves a remainder of 3 in each case, is
• A.
8739
• C.
9834
• B.
9831
• D.
9893
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