4 20 of 40 July 8, 2019 16 32 64 128 4 20 400 4 20 2 40 4 20 1 40 4 20 x 40 4 20 3 40 4 20 8 40 4 20 6 40 20 4 400 t125 4 20 5 40 4 20 plus 40 minutes 20 4 40 rule