Răspuns :
a-b=158.
a:b=18r5.
a=18b+5.
18b+5-b=158.
17b+5=158.
17b=158-5=153.
b=153:17=9.
a-9=158.
a=158+9=167
a-b=158
a/b=18 r:5=>a=18*b+5
18*b+5-b=158
17*b+5=158
17*b=158-5
17*b=153
b=153/17
b=9=>a=18*9+5=>a=162+5=>a=167
a/b=18 r:5=>a=18*b+5
18*b+5-b=158
17*b+5=158
17*b=158-5
17*b=153
b=153/17
b=9=>a=18*9+5=>a=162+5=>a=167