Number System


  1. A number when divided by 3 leaves a remainder 1. When the quotient is divided by 2, it leaves a remainder 1. What will be the remainder when the number is divided by 6?









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    The least number (dividend) x is obtained as follows :

    Correct Option: B

    The least number (dividend) x is obtained as follows :

    y = 2 × 1 + 1 = 3
    x = 3 × 3 + 1 = 10
    When we divide 10 by 6, the remainder = 4


  1. The sum of first sixty numbers from one to sixty is divisible by









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    As we know that ,

    Sum of first n numbers =
    n (n + 1)
    2

    Correct Option: D

    As we know that ,

    Sum of first n numbers =
    n (n + 1)
    2

    Sum of first 60 numbers =
    60 (60 + 1)
    =
    60 × 61
    = 1830
    22

    The number 1830 is divisible by 61.



  1. How many natural numbers divisible by 7 are there between 3 and 200 ?









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    Number just greater than 3 which is divisible by 7 = 7
    Number just smaller than 200
    which is divisible by 7 = 196
    Here, a = 7, an = 196,
    d = 7, n = 8

    Correct Option: B

    Number just greater than 3 which is divisible by 7 = 7
    Number just smaller than 200
    which is divisible by 7 = 196
    Here, a = 7, an = 196,
    d = 7, n = 8
    ∴ an = a + (n –1)d
    ⇒ 196 = 7 + (n – 1) × 7

    ⇒ n − 1 =
    196 − 7
    = 27
    7

    ⇒  n = 27 + 1 = 28
    2nd method to solve this question
    We can find the answer after dividing 200 by 7.
    The quotient is our answer.


  1. Each member of a picnic party contributed twice as many rupees as the total number of members and the total collection was 3042. The number of members present in the party was









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    Let the required number of persons be N.
    According to the question,
    2N2 = 3042

    Correct Option: A

    Let the required number of persons be N.
    According to the question,
    2N2 = 3042

    ⇒   N2 =
    3042
    = 1521
    2

    ⇒   N = √1521 = 39



  1. In a division problem, the divisor is 4 times the quotient and 3 times the remainder. If remainder is 4, the dividend is









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    Given , Remainder = 4
    According to question ,
    Divisor = 3 × Remainder
    ⇒ Divisor = 3 × 4 = 12
    Again, divisor = 4 × quotient
    ⇒ 4 × quotient = 12

    Correct Option: B

    Given , Remainder = 4
    According to question ,
    Divisor = 3 × Remainder
    ⇒ Divisor = 3 × 4 = 12
    Again, divisor = 4 × quotient
    ⇒ 4 × quotient = 12

    ⇒ Quotient =
    12
    = 3
    4

    ⇒ Dividend = 3 × 12 + 4 = 40