Table:
text: Head of the River (Queensland)
Participating Schools
Winning Head of the River Championship Events
School Location_ Enrolment Founded Denomination Day_Boarding School_Colours Abbreviation In_competition_since
All Hallows` School Brisbane 1300 1861 Catholic Day Light Blue & White AHS 1990
Brisbane Girls` Grammar School Spring Hill 1150 1875 Non-Denominational Day Royal Blue BGGS 1991
Brisbane State High School South Brisbane 2200 1921 Non-Denominational Day Sangria & Navy Blue BSHS 1990
Lourdes Hill College Hawthorne 850 1916 Catholic Day & Boarding Silver, Purple & White LHC 2000
St Aidan`s Anglican Girls` School Corinda 800 1929 Anglican Day Navy Blue, White & Brown STA 1990
St Hilda`s School Southport 750 1912 Anglican Day & Boarding Red, Yellow & Blue STH 1990

Question: How many of the participating schools participating in winning river championships are 850 under Head of the River (Queensland)?

Question: From the list of Head of the River (Queensland) winning River Championship events, participating schools, where is the school named Brisbane Girls' Grammar School located?

Question: How many schools are in South Brisbane among the schools participating in the River Championship events at the Head of the River (Queensland)?