芳芳:12,丽丽:11,娟娟:4
丽11 芳12 娟4设丽X 芳Y 娟ZX+Y+Z=27X+3-5=Y-3=Z+5Y=X+1Z=X-7X+X+1+X-7=27 X=11 Y=12 Z=4
丽丽 11芳芳 12 娟娟4张