alleryA এবং B-এর কর্মদক্ষতার অনুপাত 4:5 এবং একত্রে তাদের 20 দিন প্রয়োজন। A-এর একা প্রয়োজন
A40 দিন
B36 দিন
C50 দিন
D45 দিন
Answer & Solution
Correct answer: D. 45 দিন
মোট কাজ হল 9 একক x 20 দিন = 180 একক, এবং A দিনে 4 একক কাজ করে, তাই 45 দিন।
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