Ex 3..........................
![Ex 3 class=](https://ro-static.z-dn.net/files/d07/6ff005ece858e7763773a58e92ed25f5.jpg)
[tex]2x + 3 \times (28 - x) = 68[/tex]
[tex]2x + 84 - 3x = 68[/tex]
[tex]x = 84 - 68[/tex]
[tex]x = 16[/tex]