A) I believe but you might not want to go with it cause I'm not good at math AT ALL:)
Answer:
40 cm
Step-by-step explanation:
10x4= 40
(3/4)/3
3/12
1/4
So he spent a 1/4 hour milking each group.
The answer would be 7.5, since 6/9=2/3 and 5/7.5=2/3, then the sides are equal ratios.
