question: how many crew had u15 3rd iv being bgs and u15 1st iv being acgs and open 1st viii being acgs
answer: SELECT COUNT(crew) FROM table_11318462_5 WHERE u15_3rd_iv = "BGS" AND u15_1st_iv = "ACGS" AND open_1st_viii = "ACGS"
context: CREATE TABLE table_11318462_5 (crew VARCHAR, open_1st_viii VARCHAR, u15_3rd_iv VARCHAR, u15_1st_iv VARCHAR)