user: Question: What's the sum of the Area (KM 2) that's got a Population that's smaller than 90?
Columns: ['Place', 'Code', 'Area (km 2 )', 'Population', 'Most spoken language']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['Addo Elephant National Park', 20602.0, 1.08, 90.0, 'Xhosa']
SQL:

assistant: SELECT SUM("Area (km 2 )") FROM "Table" WHERE "Population" < 90.0;