Have to? X=80。 So what? C=80()B= 160？ ,? A=320？ -* * * A+B+C = 560 (kg)
2. let b be? x？ ,? So A is 2X? C is X-240.
Because again? Three road construction teams * * * road construction1360m x? +? 2X？ +(X-240)= 1360？ X=400
The team to be established? 800? Mi, team B 400? M, team c 160? rice
3. Let the original two iron wires be like this? x？ Cm, from the topic? Use X- 18=3(X-26) to solve the equation? X=30