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July 8th, 2018, 10:27 PM   #1
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How to solve this problem?

Two pipes A and B are connected to a tank. A can fill the tank with 80% pure milk in 7 hours, while B can fill the tank with 90% pure milk in 3 hours. What will be the purity of the milk in the tank if both the pipes are opened together to fill the empty tank?

Solution: A is 80% and B is 90%.

Here B is filling the tank fast.

I can't proceed from here. please help me.
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July 9th, 2018, 01:48 AM   #2
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The "filling-ratio" of the pipes is 3:7, so pipe A supplies 3/(3 + 7) = 30% of the tank's capacity, and pipe B supplies 70% of the tank's capacity.

Hence the purity that results will be 80% of 30% + 90% of 70% = 87%.
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July 9th, 2018, 03:31 PM   #3
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Hey Skip, you told me recently not to give out full solutions.....????

Here:
Why 4:7 is not the answer?

Last edited by Denis; July 9th, 2018 at 03:34 PM.
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July 10th, 2018, 12:02 AM   #4
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The opening post there contained "Please don't post the final answer."
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July 10th, 2018, 04:13 AM   #5
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I give up...
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