`A` is `3//4` of B, then is B is what fraction of A?

Answer

To solve the problem step by step, we start with the information given:

1. **Understanding the Relationship**:
We know that A is \( \frac{3}{4} \) of B. This can be expressed mathematically as:
\[ A = \frac{3}{4} B \]

2. **Rearranging the Equation**:
To find out what fraction of A is B, we need to express B in terms of A. We can rearrange the equation:
\[ B = \frac{4}{3} A \]

3. **Finding the Fraction**:
Now, we need to express B as a fraction of A. From the equation we derived:
\[ B = \frac{4}{3} A \]
This means that B is \( \frac{4}{3} \) times A.

4. **Conclusion**:
Therefore, B is \( \frac{4}{3} \) of A.

### Final Answer:
B is \( \frac{4}{3} \) of A.