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October 13th, 2014, 09:28 PM  #1 
Senior Member Joined: Jan 2012 Posts: 732 Thanks: 7  What percentage of the mixure is water?
If 3 gallons of spirit containing 20% water are added to 5 gallons of another spirit containing 15% water, what percentage of the mixure is water? How do I tackle this problem? 
October 13th, 2014, 09:54 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond 
$\displaystyle \frac{0.6+0.75}{8}=0.16875$

October 13th, 2014, 10:12 PM  #3 
Senior Member Joined: Jan 2012 Posts: 732 Thanks: 7 
How did you do it?

October 13th, 2014, 10:22 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond 
20% of 3 is 0.6. 15% of 5 is 0.75. Adding these gives how much water is in 8 gallons of the mixture.

October 13th, 2014, 11:17 PM  #5 
Senior Member Joined: Jan 2012 Posts: 732 Thanks: 7 
I got 16.875%.

October 13th, 2014, 11:20 PM  #6 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond 
That's correct.

October 13th, 2014, 11:44 PM  #7 
Senior Member Joined: Jan 2012 Posts: 732 Thanks: 7 
Thank you.


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mixure, percentage, water 
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