• # question_answer If 54 + 43 = 2, 60 + 51 = 10, then 62 + 72 =?. A)  30                               B)  18             C)  9                                D)  20

: We have, 54 + 43 = 2. Also, $54+43=97\to 9-7=2=60+51=10.$ Also, $60+51=111\to 11-1=10$ So, $62+72=134\Rightarrow 13-4=9.$