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Question

On dividing 12401 by a certain number, we get 76 as quotient and 13 as remainder. What is the divisor?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
163

Divisor Calculation Using Algorithm

The relationship between the dividend, divisor, quotient, and remainder is defined by the division algorithm:

$ \text{Dividend} = (\text{Divisor} \times \text{Quotient}) + \text{Remainder} $

Dividing 12401: Given Values

We are provided with the following information:

  • Dividend = 12401
  • Quotient = 76
  • Remainder = 13

Let the unknown divisor be represented by 'D'. Substitute the known values into the division algorithm equation:

$ 12401 = (D \times 76) + 13 $

Quotient and Remainder Calculation

To find the divisor 'D', we first rearrange the equation to isolate the term containing 'D':

$ 12401 - 13 = D \times 76 $

Simplify the left side:

$ 12388 = D \times 76 $

Now, solve for 'D' by dividing 12388 by 76:

$ D = \frac{12388}{76} $

Performing the division calculation:

$ D = 163 $

Remainder Check and Final Divisor

The calculated divisor is 163. This result confirms the value needed when 12401 is divided by 163, yielding a quotient of 76 and a remainder of 13.

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Important Questions from Divisibility and Remainder

  1. If a five digit number 247xy is divisible by 3, 7 and 11, then what is the value of (2y - 8x)?

  2. If the seven-digit number 94x29y6 is divisible by 72, then what is the value of (2x + 3y) for x ≠ y ?

  3. Find the greatest value of b so that 30a68b (a > b) is divisible by 11.

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