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Question

1200 apples were distributed among a group of boys. Each boy got thrice many of the apples as the number of boys in that group. The number of boys in the group was:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
20

Problem Setup: Apples Distribution

We are given a total of 1200 apples to distribute among a group of boys.

Let the number of boys in the group be represented by the variable $B$.

According to the problem, each boy received thrice the number of boys in the group. Therefore, the number of apples each boy received is $3 \times B$.

Calculating the Number of Boys

The total number of apples distributed is the product of the number of boys and the number of apples each boy received.

Total Apples = (Number of Boys) $\times$ (Apples per Boy)

We can write this as an equation:

$ B \times (3 \times B) = 1200 $

Simplify the equation:

$ 3 \times B^2 = 1200 $

To find $B^2$, divide both sides by 3:

$ B^2 = \frac{1200}{3} $ $ B^2 = 400 $

Now, find the value of $B$ by taking the square root of both sides:

$ B = \sqrt{400} $ $ B = 20 $

Conclusion

The number of boys in the group is 20.

  • Number of boys ($B$): 20
  • Apples per boy ($3B$): $3 \times 20 = 60$
  • Total apples: $20 \times 60 = 1200$

This matches the given total number of apples.

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