Ok so we going to cross multiply.
We going to put it in a fraction form. People / boxes.
20 people 50 people
————— = —————-
6 boxes X
Cross multiply
20 x (x) = 50 x 6
20x = 300 Now divide 20 on both sides
—— ——-
20 20
X = 15
Final answer : 15 boxes will feed the 50 people.