CREATE TABLE table_16998 ("Season" FLOAT, "Position" FLOAT, "Win/Loss" TEXT, "Coach" TEXT, "Captain" TEXT, "Dudley Tuckey Medal" TEXT, "Leading goalkicker" TEXT)

what is the total number of coach where captain is grant welsh and win/loss is 5-15
SELECT COUNT("Coach") FROM table_16998 WHERE "Captain" = 'Grant Welsh' AND "Win/Loss" = '5-15'
SELECT COUNT("Coach") FROM "table_16998" WHERE "Captain" = 'Grant Welsh' AND "Win/Loss" = '5-15'