Alberto is in charge of making lunch at summer camp. He knows that 3 tuna casseroles will serve 15 campers. How many tuna casseroles will he have to make to serve 35 campers?

Question
Alberto is in charge of making lunch at summer camp. He knows that 3 tuna casseroles will serve 15 campers. How many tuna casseroles will he have to make to serve 35 campers?
Answer:
Step-by-step explanation:
you can solve in this way
3 : 15 = x : 35
x = 3 * 35 : 15
x = 7