2. Let B = 5x, then A = 26x, C = 3x/2 and D = 18x/50, so a: b: c: d =1300: 250: 75:18.

3. The total number of trees planted by the two teams: 2× ~ 2400 ~16+/kloc-0 ~+2× ~ 2400 ~16 = 602.

B: 602 ÷ 2- 16 = 285

A: 602-285 = 3 17.