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Question

Out of four consecutive numbers, the sum of the first two numbers is equal to the fourth number. What is half of the sum of the four numbers?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
7

Consecutive Numbers Sum Problem Explained

This problem involves finding four consecutive numbers based on a given condition and then calculating half of their sum.

1. Define the Consecutive Numbers

Let the four consecutive numbers be represented algebraically:

  • First number: $n$
  • Second number: $n + 1$
  • Third number: $n + 2$
  • Fourth number: $n + 3$

2. Set Up the Equation from the Condition

The problem states that the sum of the first two numbers equals the fourth number:

$n + (n + 1) = n + 3$

3. Solve for 'n'

Simplify and solve the equation:

  • Combine like terms: $2n + 1 = n + 3$
  • Subtract $n$ from both sides: $n + 1 = 3$
  • Subtract 1 from both sides: $n = 2$

4. Determine the Four Consecutive Numbers

Substitute the value of $n$ back into the expressions for the numbers:

  • First number: $n = 2$
  • Second number: $n + 1 = 2 + 1 = 3$
  • Third number: $n + 2 = 2 + 2 = 4$
  • Fourth number: $n + 3 = 2 + 3 = 5$

The four consecutive numbers are 2, 3, 4, and 5.

5. Calculate the Sum of the Four Numbers

Add the four numbers together:

Sum = $2 + 3 + 4 + 5 = 14$

6. Find Half of the Sum

Calculate half of the total sum:

Half of Sum = $14 / 2 = 7$

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