For this case what we should do is find the total weight of the food.
We have then:
There are 3 different cheeses. Yasuko buys 3/4 of a pound of each:

There are also 4 different meats. She buys 1/2 of a pound of each:

Then, the total sum is given by:

Answer:
The total food that yasuko did buy at the deli was:
