Question

12+m

`(12 + m)/(?20 + m) = 0.90`
What is M?

Answer 1

`(12+m)/(20+m)=0.9\\\\20+m\\eq0\to m\\eq-20\\\\0.9=(9)/(10)\\\\(12+m)/(20+m)=(9)/(10)\ \ \ |\text{cross multiply}\\\\(12+m)\cdot10=(20+m)\cdot9\\\\(12)(10)+(m)(10)=(20)(9)+(m)(9)\\\\120+10m=180+9m\ \ \ \ |-120\\\\10m=60+9m\ \ \ |-9m\\\\m=60`