Question

816:?=9(ост6),725:?=8(ост5), 543:?=6(ост3)

Answer 1

816 : ? = 9 ( ост. 6)
? = 816 : 9
? = 90 ( ост. 6)
816 : 90 = 9 ( ост. 6)

725 : ? = 8 ( ост. 5)
? = 725 : 8
? = 90 ( ост. 5)
725 : 90 = 8 ( ост. 5)

543 : ? = 6 ( ост. 3)
? = 543 : 6
? = 90 ( ост. 3)
543 : 90 = 6 ( ост. 3)