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August 3rd, 2018, 05:34 PM   #11
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Mixture #1
3 cups of water mixed with 5 cups of milk in one container.

Mixture #2
7 cups of water mixed with 8 cups of milk in another.

Mixture #1 is to be mixed with Mixture #2 in the ratio of 4:7

So 4 times Mixture #1 would be 12:20 (12 cups of water and 20 cups of milk)
And 7 times Mixture #2 would be 49:56 (49 cups of water and 56 cups of milk)

Now add all the water together, and add all the milk together, and from that you have the required ratio.
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August 3rd, 2018, 06:55 PM   #12
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That's incorrect and doesn't give the ratio. However, the ratio wasn't required, just the reason why 4:7 wouldn't be correct, which has already been explained.
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