Average of 12 numbers is 20. Average of the first 5 numbers is 18 and average of the last 6 numbers is 22. Find the 6th number.
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12 to 20 -->240
5 to 8 -->40
6 to 22 -->132
so 240-(132+40)=68 is that number
5 to 8 -->40
6 to 22 -->132
so 240-(132+40)=68 is that number
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