Answer:
Answers are down below!! ;)
Explanation:
1. 7 : 4
 7 or 4
 7 to 4 
2. You will need 20 cups of milk.
ratio = 35:20
explanation: 35/7 = 5 and 4 x 5 =20
Bar diagram: (sorry it looks messy)
 
cups of flour l____________________________________________
cups of milk l_____________________
 _________________________________________________
 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38..
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Hope this helps!! ;)