If two batches of soup serve 8 people, then 1 batch will serve 8/2 = 4 people.
This means that:
1/4 = x/120
x = 30 batches
Each batch needs two onions, so we do 30 * 2 = 60 onions.
[tex] \frac{8}{4} = \frac{120}{x} [/tex] where x is the amount of onions needed
8x = 480
x = 60
