alleryدیوار کے لیے دو اینٹوں کو بالترتیب 14 اور 21 دن درکار ہیں۔ مل کر کام کرنا ان کی ضرورت ہے۔
A8.4 دن
B8 دن
C7 دن
D9 دن
Answer & Solution
Correct answer: A. 8.4 دن
1/14 + 1/21 = 5/42 فی دن، لہذا دیوار میں 42/5 = 8.4 دن لگتے ہیں۔
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