If  264 * 2 = 6,  870 * 3 = 11   then,   715 * 5 = ?

9 16 8 6

8

264/2  =  132 = 1 + 3 + 2 = 6 870/3  =  290 = 2 + 9 + 0 = 11 715/5  =  143 = 1 + 4 + 3 = 8  So, correct answer is option (C).