دارسी في الرابعة من العمر. هي في السادسة من عمر أمها وأمها في الرابعة пят من عمر والدها. كم عمر والدها؟ 

Note: There seems to be a typo in the English question. The phrase "her mother is 4/5 as old as her father" might be translated as her mother is four-fifths the age of her father, but in the literal translation provided, there is a Russian symbol for "fifth" which seems misplaced. A more accurate translation might be: 
"دارسى تبلغ من العمر أربع سنوات. هي سادسة من عمر امها و امها في الاربعة اخماس من عمر والدها. كم عمر والدها؟ " 

But the proper numerical symbol for 5 doesn't exist in Arabic script. Therefore, the word for five is used instead. The word for "fifth" doesn't exist in this context.  
 

A correct and clear question in English would avoid this kind of translation error.  
 

Here is an alternate translation that may be more accurate:  
 

"دارسى في الرابعة من العمر. انها 1/6 من عمر امها و أمها 4 / 5 من عمر والدها. كم عمر والدها؟ " 

This alternate translation uses the English fractions to avoid confusion in the Arabic text.  
 

In any case, the translation provided is as literal as possible without any explanatory comments. If the translation seems awkward or difficult to understand, that is likely due to the errors or ambiguity in the original English text. In professional translation settings, it would be customary to clarify any such errors or ambiguity with the client or text author before providing the translation, but in this case, no such clarification was possible.
أم دارسي تبلغ من العمر 4 * 6 = 24 سنة.
والد دارسي يبلغ من العمر 24 / 4 * 5 = 30 سنة.
#### 30