Table: grand_prix_1995
Columns: driver
constructor
laps
time_retired
grid

Question: David Coulthard was the driver in which grid?
SQL: SELECT "grid" FROM grand_prix_1995 WHERE "driver" = 'david coulthard'

Question: How many laps were there in grid 21?
SQL: SELECT "laps" FROM grand_prix_1995 WHERE "grid" = '21'