Connecting Averages Jerry

well 8 + 9 + 3 + 0 is equal 20, when 20 is divided by 4 the result is 5. Thus 5 is the only option for the number in the middle. in the second task, we can see that 4 is in one of the middle boxes, the 3 numbers surrounding 4 is 8 and 1 and 1 which adds up to 10. for 4 for be in the middle, the 4 numbers around it must add to 16. 16 - 10 is 6 thus the number to the right of 4 (which is also the other blank number). to check this we can see if the 4 numbers around 6 adds up to 6 x 4 = 24. 15 + 3 + 4 + 2 = 24. Thus 6 is the number in the right blank spot. Thus the only numbers possible for the 2 squares on the second problem are 4 and 6 in the blank spots respectively.