164=64, 16-4=12, 19+19=38, 319=57, 72/2=36, 72/3=24, 70/14=5, 56/14=4, 15+48=63, 49+15=64, 75/25=3, 50/25=2.
164=64, 16-4=12, 19+19=38, 319=57, 72/2=36, 72/3=24, 70/14=5, 56/14=4, 15+48=63, 49+15=64, 75/25=3, 50/25=2.