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Aptitude - Aptitude-Number System

Read many objective multiple choice questions of Aptitude - Aptitude-Number System in English. Practise online thousands of questions related to Aptitude - Aptitude-Number System. You can check online answer and try mock tests for Aptitude - Aptitude-Number System Questions provided in English.

How many prime numbers are less than 50 ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    Prime numbers less than 50 are:
    2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47

A boy multiplied 987 by a certain number and obtained 559981 as his answer. If in the answer both 9 are wrong and the other digits are correct, then the correct answer would be ?

  • a
  • b
  • c
  • d
  • OOPS, your answer is incorrect

    So, the required number must be divisible by each one of 3, 7, 47
    553681  (Sum of digits = 28, not divisible by 3)
    555181  (Sum of digits = 25, not divisible by 3)
    555681 is divisible by 3, 7, 47.

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