答案如下：设大米的质量为x吨,则面粉的质量为60%x吨.由题意可列方程：x - 60%x = 18.5解方程,得40%x = 18.5解得x = 46.25所以,60%x = 60% × 46.25 = 25.75（吨）答：这个粮库云锦面粉和大米分别是25.75吨,46.25吨....