The average of 7 numbers is 50. The average of first 3 is 40, while the average of last 3 is 60. What must be the remaining number
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Total 7 Nos=7x50=350
Total of Ist 3 nos=3x40 = 120
Total of last 3 nos=3x60=180
........................ 6 Nos=300
The 7th Nois 350-300 = 50
Ans50
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