Question

I need a perfect answer for this and fast answer. URGENT!
Mix W- 3 cups of concentrate and 4 cups of cold water
Mix X- 3 cups of concentrate and 5 cups of cold water
Mix Y- 6 cups of concentrate and 9 cups of water
Mix Z- 5 cups of concentrate and 8 cups of water.
Ques:
1. If you made a single batch of mix W, what fraction of the batch would be concentrate? Answer the same question for mixes X Y and Z.

Answer 1

(w-3)/(w+1)
(x-3)/(x+2)
(y-6)/(y+3)
(z-5)/(z+3)

Answer 2

I didn't get it :S
Could you explain clearly?

Answer 3

See, if you take the case of w,
we have w-3 cups of concentrate.Now we add 4 cups of water, so the total number of cups becomes
w-3+4 = w+1.
Now the fraction of the concentrate is the number of cups of concentrate by the total number of cups of the batch,
hence
(w-3)/(w+1)

Answer 4

OHHH! Thanks! :)