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Q.

The average of 6 numbers is 40. If each of the firstthree numbers is increased by 4 and each of the remaining three numbers is decreased by 6, then the new average is 

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a

42

b

36

c

39

d

30

answer is C.

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Detailed Solution

Sum of the six numbers= 6 x 40 = 240 

Change in the sum of six numbers

 = (3 X 4) - (3 X 6)

 = 12 - 18 = - 6

 New average =2346=39

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