Question

The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number? *

Answer 1

Answer:

Step-by-step explanation:

total sum of 13 numbers = 13*60

                                        =780

sum of first 7 numbers = 7*57

                                      =  399

sum of last 7 numbers = 7*61

                                     = 427

then sum of last 6 numbers = 780-399

                                              = 381

hence the 8th number = 427-381

                                     = 46     answer

Answer 2

Answer:

Total sum of 13 numbers = 13*60

= 780

= Sum of first 7 numbers. = 7*57

= 399

= Sum of last 7 numbers = 7*61

= 427

= Then sum of last 6 numbers 780 - 399

= 381

The 8th number = 427 - 381

= 46 Answer