4+3+2=9
Length = 18*4/9=8dm
Width = 18*3/9=6dm.
Height = 18*2/9=4dm
2、5+3=8
Total population = 120/(5/8-3/8)=480,
Boys =480*5/8=300, girls =480*3/8= 180.
3、 10+9= 19
Total number of eggs = 2/(1019/19) = 38,
Big hen: 38* 10/ 19=20. Little hen: 38*9/ 19= 18.