Question

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Answer 1

e) 175+7•0-b:9=166
175+0-b:9=166
175-b:9=166
b:9=175-166
b:9=9
b=9•9=81

f) (901-859):b-3•2=1
42:b-6=1
42:b=1+6
42:b=7
b=42:7=6

g) 28:b•9-6•10=3
28:b•9-60=3
28:b•9=60+3
28:b•9=63
28:b=63:9
28:b=7
b=28:7=4

h) (100-10•9):b•5=10
(100-90):b•5=10
10:b•5=10
10:b=10:5
10:b=2
b=10:2=5