Question 945579
      Let p represent the fourth score
  (add all scores/occurrence = average) 
   (139+143+144+p)/4 = 145
   (426+p)/4 = 145/1
     Cross multiply
. 426+p = 4(145)
  426+p = 580
   Collect like term
  p = 580-426
  p = 154
Since p represent the fourth score
Therefore Alice need to score 154 in her fourth game to get the average score of 145