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Question

If \(155\over0.155\) = \(15.5\over k\), then the value of K is:

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

0.0155

Solving the Equation for K

The problem asks us to find the value of K given the equation:

\( \frac{155}{0.155} = \frac{15.5}{k} \)

We need to solve this equation to find the specific numerical value for k.

Step-by-Step Calculation

  1. Simplify the Left Side: First, let's simplify the fraction on the left side of the equation, which is \( \frac{155}{0.155} \).

    To make the division easier, we can rewrite 0.155 as \( \frac{155}{1000} \).

    So, the left side becomes:

    \( \frac{155}{\frac{155}{1000}} \)

    Dividing by a fraction is the same as multiplying by its reciprocal:

    \( 155 \times \frac{1000}{155} \)

    The 155 terms cancel out:

    \( = 1000 \)

  2. Set Up the Simplified Equation: Now, we substitute the simplified value back into the original equation:

    \( 1000 = \frac{15.5}{k} \)

  3. Solve for K: To isolate k, we can rearrange the equation. Multiply both sides by k:

    \( 1000 \times k = 15.5 \)

    Now, divide both sides by 1000:

    \( k = \frac{15.5}{1000} \)

  4. Final Calculation: Perform the division:

    \( k = 0.0155 \)

Conclusion

By following the steps of simplifying the initial fraction and then algebraically solving for k, we find that the value of k is 0.0155.

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