how many exposures where there when the total exposure time is 105,000s?
CREATE TABLE "observations_made_of_the_hdf_s_with_the_" (
  "camera" text,
  "filter" text,
  "wavelength" text,
  "total_exposure_time" text,
  "exposures" real
);
SELECT "exposures" FROM "observations_made_of_the_hdf_s_with_the_" WHERE "total_exposure_time"='105,000s';