Answer:
1:2 and 12
Explanation:
2: 4 is equivalent with anothher ratio if you did the exact same multiplication and division to both terms
you have
1 : 2 from 2/2 : 4/2 so in good
7 : 8 is no good
4: 2 is no good
6: 10 is no good
3 olive oil : 1 vinegar
x olive oil : 4 vineger ( we multiply both by 4)
3*4 olive oil : 1*4 vinegar
12 olive oil : 4 vinegar