Final answer:
The chef uses a total of 3 and 15/4 pounds of semolina flour.
Step-by-step explanation:
In this question, the chef uses 3/3/4 pounds of semolina flour.
To simplify the fraction 3/3/4, we can first convert the mixed number 3/4 into an improper fraction. To do so, we multiply the whole number (3) by the denominator (4) and add the numerator (3) to get 15/4. Therefore, the chef uses a total of 3 and 15/4 pounds of semolina flour.