Hongjiang had $$630\text{ml}$$ of orange juice. He gave $$\frac{5}{7}$$ of it to Grace and $$\frac{1}{9}$$ of the remainder to Evelyn. How much orange juice did he have left?~\uline{~~~~~~~~~~}~$\text{ml}$. 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Knowing the Base