The sum of seven numbers is 235. The average of the first three is 23 and that of the last three is 42. The fourth number is  Choose the most appropriate option: A) 40 B) 126 C) 69 D) 195 E) None
Explanation:   Average of the first three is 23. Therefore their sum = 23 x 3   Average of the last three is 42. Therefore their sum = 42 x 3   Sum of all number = Sum of first three + Fourth number + Sum of last three   (23×3+a+42×3)=235⇒a=40   Correct Option: 40
<result>A</result>
The sum of seven numbers is 235. The average of the first three is 23 and that of the last three is 42. The fourth number is