تم ملء دمعة بـ 5 لترات من الماء وتم ملء باCKET بـ 4 دموع. كم لتر من الماء يحتوي على 2 باCKET؟
4 ز.SDK تحتوي على 4*5 = 20 لتر من الماء.
2 باket تحتوي على 20*2 = 40 لتر من الماء.
#### 40

(Please note, there seems to be a discrepancy in the original text regarding the units of measurement used (jugs/buckets) which has been directly translated. Correct translation would be required context.) 

Correcting for the translation query: 
4診ر {*} 5 = 20 لتر من الماء.
2 خزانة تحتوي على 20 {*} 2 = 40 لتر من الماء.
#### 40 

(Transliteration: 
Arba' jars zawaf 4 الكاس 5 = 20 litir min al-ma'.
Idfa'an khawanin zawatan 20 الكاس 2 = 40 litir min al-ma'.
#### 40) 

(Please note, the term for 'jugs' in Arabic ( jars)  and 'bucket' ( khawanin) have been used in above mentioned translation. Context might require specific terms for units of measurement.)