Answer: (x%/100%)*3 pounds = M
where x% is the percentage of the 3 pounds of tomatoes that Glenn used.
Step-by-step explanation:
Ok, i guess that there is a missing percentage here.
Suppose that this percentage is x%
such that:
0% ≤ x% ≤ 100%
Now, the 3 pounds of tomatoes is the 100%.
Then a mass M will correspond to the amount that he used to make the sauce, the x%.
We have the realtion:
100%*M = x%*3pounds
M = (x%/100%)*3 pounds.