Questions & Answers about در این کارخانه، نسبت ضایعات چهار در هزار است.
How does the phrase chahār dar hezār work grammatically in this sentence?
It acts as the predicate of the sentence following the lesson's proportion pattern: [Numeral] + dar + [Numeral]. Just like in English, dar (in) connects the smaller number to the larger total to express a ratio.
The preposition dar appears twice here. Is it doing the exact same job both times?
Not quite. The first dar (dar in kārkhāneh) is the standard spatial preposition meaning "in" or "inside." The second dar (chahār dar hezār) is mathematical, functioning like "out of" or "in" to establish a statistical proportion.
Why does the word for scrap, zāye'āt, have an -āt ending?
The -āt ending is an Arabic plural suffix commonly used for loanwords in Farsi. Notice that while it is technically plural in Farsi (literally "wastes" or "casualties"), English usually treats "scrap" as an uncountable singular noun.
How are the words for "proportion" and "scrap" linked together?
They are connected by the invisible ezafe vowel, creating nesbat-e zāye'āt. Here, the ezafe translates neatly to "of", linking the measurement to the specific thing being measured.