alleryایک درزی 20 دنوں میں ایک بیچ سلائی کرتا ہے، اس کا ساتھی 30 دنوں میں۔ وہ ایک ساتھ مل کر ختم کرتے ہیں۔
A25 دن
B12 دن
C10 دن
D15 دن
Answer & Solution
Correct answer: B. 12 دن
ان کی مشترکہ شرح 1/20 + 1/30 = 5/60 = 1/12 فی دن ہے، 12 دن دیتے ہیں۔
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