To find the final answer that Hiroshi should have gotten when he multiplied \( \frac{2}{7} \) by \( 3 \), we can follow these steps:
- Multiply the fraction by the whole number: \[ \frac{2}{7} \times 3 = \frac{2 \times 3}{7} = \frac{6}{7} \]
So, the final answer Hiroshi should have gotten is \( \frac{6}{7} \).