If the mean of 3,5,6,7,x is 6 then find value of "x "
a) 8. b) 7. c).5. d ) 9.
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Short trick-
6 is mean. Take it as central number of number chain. Now
3+2=5, 5+1=6
So 6+1=7, then 7+2=9
Answer is 9
6 is mean. Take it as central number of number chain. Now
3+2=5, 5+1=6
So 6+1=7, then 7+2=9
Answer is 9
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