I got it, but instictively I thought it was 100. When I read 'This is a simple question,' however, it was obvious that the instinctive answer was going to be wrong. Then I got the right answer.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell