grammatical number - Why is the singular of “week” used in “two-week business trip”?





Pluralization rule for “five-year-old children”, “20 pound note”, “10 mile run”



According to Google, it is correct to say "two-week business trip" instead of "two-weeks business trip". So "week" word should be used in singular form which looks strange for me as non-native speaker. Is there any special rule for this kind of phrases?




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