CREATE TABLE table_11318462_5 (crew VARCHAR(255), open_1st_viii VARCHAR(255), u15_3rd_iv VARCHAR(255), u15_1st_iv VARCHAR(255))
how many crew had u15 3rd iv being bgs and u15 1st iv being acgs and open 1st viii being acgs
    
SQL: SELECT COUNT(crew) FROM table_11318462_5 WHERE u15_3rd_iv = "BGS" AND u15_1st_iv = "ACGS" AND open_1st_viii = "ACGS"