1.

Average of 7 consecutive numbers is A. If 2 numbers which are before these 7 numbers are also taken, then what will be the new average?1). A - 12). A - 0.53). A + 1.54). A

Answer»

LET the 7 consecutive number be (x - 3), (x - 2), (x - 1), (x), (x + 1), (x + 2), (x + 3)

The sum of above consecutive number = 7x

⇒ Average of numbers = The sum of above consecutive number/7 = A

⇒ x = A

After adding 2 numbers which are before these 7 numbers, we get

The numbers are (x - 5), (x - 4), (x - 3), (x - 2), (x - 1), (x), (x + 1), (x + 2), (x + 3)

⇒ Sum = 9X - 9

Average = 9(x - 1)/9 = x - 1 = A - 1


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