Question

a recipe for lasagna calls for 3 pounds of tomatoes to serve 5 people. a caterer wants to make enough lasagna to serve 110 people. how many pounds of tomatoes does he needs

Answer 1

it is 66 pounds

Answer 2

To do this you want to divide 110 by 5 to get 22.  Now you want to multiply 3 by 22. That means the caterer need 66 pounds of tomatoes.