3 4 x 16 21 July 8, 2019 16 32 64 128 3 4 x 16 21 as a fraction 16 3 4 x 21 1 2 air conditioner filter 6 1 4 x 16 21 3 Ac filter 16 3 4 x 21 1 2 6 1 4 x 16 21 divided by 3