Question

The average of nine numbers is 48. The average of the first four numbers
is 43 and the average of the last four numbers is 50. What is the ninth
number?​

Answer 1

Step-by-step explanation:

Average of nine nos. = 48

Average = Sum of nos./No. of items

Then, Same of nos. = Average*No.of items

Or, 48*9=432

Average of first four nos. = 43

Sum of first four nos. = 43*4 = 172

Average of late four nos. = 50

Sum of last four nos. = 50*4 =200

Sum of 8 nos. = 200+172 = 372

The ninth no. = 432-372 = 60