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Old Friday, October 16, 2015
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Thumbs down solve this mathematics puzzle

can you solve the empty the tank math puzzle?
you have a 30-gallon tank of water,an empty 11-gallon conatiner,and an empty 7-gallon container.
How can you empty exactly half of the tank of water using only the 11-gallon and 7-gallon containers?
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Old Friday, October 16, 2015
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Default 30 - 11 + 7 - 11 = 15

Fill the 11 gallon container from tank. Now tank will have 30 - 11 = 19 gallons of water. And from the that 11 gallon container fill the 7 gallon container. So, in 11 gallon container the water remained will be 11 - 7 = 4 gallons. Throw those 4 gallons empty the 11 gallon container. And the drop the water of 7 gallon container back in to the tank. So tank will have 19 + 7 = 26 gallons of water.

Now our both containers are empty and tank has 26 gallons. Fill the 11 gallon container from tank. Now tank will have 26 - 11 = 15 gallons. Tank is now half full.
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