Given this paragraph, how many public high schools are in Arlington, Virginia?

Arlington Public Schools operates the county's public K-12 education system of 22 elementary schools; 6 middle schools (Dorothy Hamm Middle School, Gunston Middle School, Kenmore Middle School, Swanson Middle School, Thomas Jefferson Middle School, and Williamsburg Middle School); and 3 public high schools (Wakefield High School, Washington-Liberty High School, and Yorktown High School). H-B Woodlawn and Arlington Tech are alternative public schools. Arlington County spends about half of its local revenues on education. For the FY2013 budget, 83 percent of funding was from local revenues, and 12 percent from the state. Per pupil expenditures are expected to average $18,700, well above its neighbors, Fairfax County ($13,600) and Montgomery County ($14,900).[135]

There are 3 public high schools in Arlington, Va.