Two sitar strings A and B playing the note 'Dha' are slightly out of tune and produce beats of frequency 5 Hz. The tension of string B is slightly increased and the beat frequency is found to decrease to 3 Hz. What is the original frequency of B, if the frequency of A is 427 Hz?

Explanation

To solve the problem, we need to determine the original frequency of string B based on the information provided about the beat frequencies and the frequency of string A.

### Step-by-Step Solution:

1. **Identify the given information:**
- Frequency of string A (nA) = 427 Hz
- Initial beat frequency = 5 Hz
- New beat frequency after increasing tension = 3 Hz
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