The correct answer is: 177.44 mL (for US fluid ounces)
Explanation
6 ounces of soup typically means 6 US fluid ounces. Use the conversion $1\text{ fl oz} = 29.5735295625\text{ mL}$.
Steps:
- Multiply: $$6\times29.5735295625=177.441177375\text{ mL}$$
- Round to a sensible precision: 177.44 mL
Note: If you meant 6 Imperial (UK) fluid ounces instead, use $1\text{ imp fl oz}=28.4130625\text{ mL}$, which gives $$6\times28.4130625=170.478375\text{ mL}\approx170.48\text{ mL}.$$