To get the answer we can use proportion
8 ginger ----------------- 3 fruit
12 ginger ----------------x
Crossmultiply now
8x=12*3 /:8
x=

x=<u />

To not change ratio we have to have 4.5 cups of fruilt juice. We initialy had 3, so we have to add 1.5 cup of fruit juice.
If I'm not wrong I believe it would be 343 different ways.
25/100 = 1/4 (divide both numerator and denominator by 25)
350/1000 = 35/100 = 7/20.