The average of 13 results is 40 and that of first six is 30 and last six is 34. Find the value of 7 th number.
Solution : 7 th number will be = Sum of 13 results - ( Sum of first six + Sum of last six ) = ( 13 * 40 ) - ( 6 * 30 + 6 * 34 ) = 136
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