Question

What's the anwser to 5 6 7

Answer 1

5.)
n=3x45
(3)(45)
n=135

6.)
643=4*160+n
643=(4)(160)+n
643=n+640
n+640=643
n+640-640
643-640
n=3

7.)
n=6*35 +4
(6)(35)+4
n=(6)(35)+4
n=214

Answer 2

5: n=135
6: n=3
7: n=214