Answer:
1/2 or 0.5
Step-by-step explanation:
For 3 cups she needs 1/8 of onions.
so for 1 cup she will need 1/8 ÷ 3 = 1/8 × 1/3 = 1/24.
for 1 cup of soup she needs 1/24 of onions.
For 12 cups of soup, she will need 12 × 1/24 of onions
12/1 × 1/24 = 12/24 = 1/2 or 0.5