Which of the following strategies is helpful when solving the following word problem?

There were 52 lbs. of vegetables from four farmers in the area that were to be delivered to the local food bank. If Mr. Greenjeans provided 7 pounds of vegetables, Mr. Cowpatrick provided 12 pounds of vegetables, and Mrs. Chickenroost provided 10 pounds of vegetables, how many pounds of vegetables did Mrs. Turkeyroast provide?