Question

a+b=139 a:2b=10 rest 6

Answer 1

a+b=139
a:2b=10r6⇒a=2b*10+6
inlocuim pe a in prima ec si obt
20b+6+b=139
21b+6=139
21b=139-6
21b=133
b=133:21
b=6.33
a+6.33=139
a=139-6.33
a=132.67