Aptitude - Arithmetical Ability

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7.

The product of the L.C.M. and H.C.F. of two numbers is 24. The difference of two numbers is 2. Find the numbers.                        


A. 2 and 4 B. 6 and 4
C. 8 and 6 D. 8 and 10




8.

Find the smallest number which is divided by 6, 7, 8, 9 and 12 each time and I remains?                        


A. 500 B. 505
C. 690 D. 720




9.

Find the greatest number that will divide 43, 91 and 183 so as to leave the same remainder in each case.                        


A. 4 B. 7
C. 9 D. 13




10.

The greatest number of four digits which is divisible by 15, 25, 40 and 75 is:                        


A. 9000 B. 9400
C. 9600 D. 9800




11.

Let the least number of six digits, which when divided by 4, 6, 10 and 15, leaves in each case the same remainder of 2, be N. The sum of the digits in N is:                        


A. 3 B. 4
C. 5 D. 6




12.

The traffic lights at three different road crossings change after every 48 sec, 72 sec and 108 sec respectively. If they all change simultaneously at 8 : 20 : 00 hours, then they will again change simultaneously at                         


A. 8 : 27: 12 hrs B. 8:27:36 hrs
C. 8: 27: 24 hrs D. 8:27:48 hrs




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