CREATE TABLE table_15988037_24 (total INTEGER, average VARCHAR)
SELECT MAX(total) FROM table_15988037_24 WHERE average = "28.5"
ผลรวมสูงสุดที่ค่าเฉลี่ยคือ 28.5 คือเท่าใด
What is the maximum total in which the average is 28.5?