Table: toyota_racing_results
Columns: year
chassis
engine
tyres
points

Question: Tell me the average points with tyres of b and chassis of tf109
SQL: SELECT AVG("points") FROM toyota_racing_results WHERE "tyres" = 'b' AND "chassis" = 'tf109'

Question: Tell me the total number of points with chassis of tf103
SQL: SELECT COUNT("points") FROM toyota_racing_results WHERE "chassis" = 'tf103'