72 + 72 + 42 = 186
99 + 99 + 88 + 88 + 72 + 72 = 518
72 + 72 = 144
8100 plus 90 plus 72 is equal to 8,262.
72. 18*4=72
76 & 2/3
4 plus 4 isn't 72. It is actually 72. :O
96+72+48+24=240
The atomic number of hafnium is 72. So there is 72 protons.
uhh... 144...
49 + 72 + 68 = 189
84 + 96 + 72 + 77 + 91 = 420