by nathi123 » Mon Aug 27, 2018 12:32 pm
Let C finish work in x days [tex]\Rightarrow for 1 day C finish[/tex] [tex]\frac{1}{x}[/tex]of work; A finish for 1 day [tex]\frac{1}{12}[/tex]; B- for 1 day finish [tex]\frac{1}{18}[/tex]
[tex]\Rightarrow \frac{4}{12} + \frac{4}{18}+\frac{4}{x} = 1 \Leftrightarrow 3x+2x+36=9x\Leftrightarrow x=9[/tex] days.
Let C finish work in x days [tex]\Rightarrow for 1 day C finish[/tex] [tex]\frac{1}{x}[/tex]of work; A finish for 1 day [tex]\frac{1}{12}[/tex]; B- for 1 day finish [tex]\frac{1}{18}[/tex]
[tex]\Rightarrow \frac{4}{12} + \frac{4}{18}+\frac{4}{x} = 1 \Leftrightarrow 3x+2x+36=9x\Leftrightarrow x=9[/tex] days.