Quantitative Aptitude :: Average - Discussion

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Explanation:
Let the first number be x,
So last number will be (x+6)

Average = [x+(x+1)+(x+2)+(x+3)+(x+3)+(x+4)+(x+5)+(x+6)]/7 = 20

=> (7x+21) = 20*7
=> 7x = 119
=> x = 17

So largest number= (x+6) = (17+6) = 23