The average of 12 numbers is 18.5. the average of first six numbers is 16.8 and that of the last seven numbers is 17.4.
Answers
Answered by
3
Comolete Question : - The average of 12 numbers is 18.5. the average of first six numbers is 16.8 and that of the last seven numbers is 17.4. Then what would be the seventh number.
Answer :-
The seventh number is 0.6
1) The sum of the complete set of 12 numbers would be 12* average of the 12 numbers i.e. 12*18.5 = 222
2) The sum of first 6 numbers would be 6* average of first 6 numbers i.e
6*16.8 = 100.8
3) The sum of last seven numbers would be 7* average of last 7 numbers i.e 7*17.4 = 121.8
4) The seventh number would be the sum of first six numbers + sum of last seven numbers -total sum of 12 numbers = 121.8+100.8 -222 = 0.6
Similar questions