Class II

Three number are in the ratio of 3 : 4 : 5 and their L.C.M. is 2400. Their H.C.F. is:
  1. 40
  2. 80
  3. 120
  4. 200
The least number which should be added to 2497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:
  1. 3
  2. 13
  3. 23
  4. 33
The least multiple of 7, which leaves a remainder of 4, when divided by 6, 9, 15 and 18 is:
  1. 74
  2. 94
  3. . 184
  4. 364
The H.C.F. of 9 , 12 , 18 and 21 is: 10 25 35 40
  1. . 3 5 m
  2. 252 5
  3. . 3 1400
  4. . 63 700
The smallest number which when diminished by 7, is divisible 12, 16, 18, 21 and 28 is:
  1. 1008
  2. 1015
  3. 1022
  4. 1032
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