HCF and LCM Practice Question and Answer

Q:

Three Alarm make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is

838 0

  • 1
    10:07:36 hrs
    Correct
    Wrong
  • 2
    10:07:24 hrs
    Correct
    Wrong
  • 3
    10:07:12 hrs
    Correct
    Wrong
  • 4
    10:07:48 hrs
    Correct
    Wrong
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Answer : 3. "10:07:12 hrs"

Q:

A number of friends decided to go on picnic and planned to spend Rs. 108 on eatables. Three of them however did not turn up. As a consequence, each one of the remaining had to contribute Rs 3. extra. The number of them who attended the picnic was:

2716 0

  • 1
    15
    Correct
    Wrong
  • 2
    12
    Correct
    Wrong
  • 3
    9
    Correct
    Wrong
  • 4
    6
    Correct
    Wrong
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Answer : 3. " 9"

Q:

The HCF and LCM of two numbers are 12 and 336 respectively. If one of the number is 84, the other is

1092 0

  • 1
    36
    Correct
    Wrong
  • 2
    48
    Correct
    Wrong
  • 3
    72
    Correct
    Wrong
  • 4
    96
    Correct
    Wrong
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Answer : 2. "48"

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Answer : 2. "6"

Q:

The sum of two numbers is 84 and their HCF is 12. Total number of such pairs of number is 

1823 0

  • 1
    2
    Correct
    Wrong
  • 2
    3
    Correct
    Wrong
  • 3
    4
    Correct
    Wrong
  • 4
    5
    Correct
    Wrong
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Answer : 2. "3"

Q:

If the ratio of two numbers is 13 : 15 and their L.C.M. is 39780. Then the numbers are?

1458 0

  • 1
    2550 and 3450
    Correct
    Wrong
  • 2
    2652 and 3060
    Correct
    Wrong
  • 3
    2250 and 2340
    Correct
    Wrong
  • 4
    2450 and 3450
    Correct
    Wrong
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Answer : 2. "2652 and 3060"

Q:

If the product of three consecutive numbers is 210 then the sum of the smaller numbers is: 

1209 0

  • 1
    5
    Correct
    Wrong
  • 2
    11
    Correct
    Wrong
  • 3
    3
    Correct
    Wrong
  • 4
    4
    Correct
    Wrong
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Answer : 2. "11"

Q:

The LCM of four consecutive numbers is 60 The sum of the first two numbers is equal to the fourth number. What is the sum of four numbers? 

478 0

  • 1
    17
    Correct
    Wrong
  • 2
    14
    Correct
    Wrong
  • 3
    21
    Correct
    Wrong
  • 4
    24
    Correct
    Wrong
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Answer : 2. "14"

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