How many times was the mens u20 recorded when the Womens 40 were Sydney Scorpions def North Queensland Cyclones?
create table table_16724844_1 (mens_u20 varchar, womens_40 varchar, PRIMARY KEY (mens_u20))
select count(mens_u20) from table_16724844_1 where womens_40 = "sydney scorpions def north queensland cyclones"