alleryএখন দেৱালৰ বাবে দুজন ৰাজমিস্ত্ৰীক ক্ৰমে 14 আৰু 21 দিন প্ৰয়োজন। একেলগে কাম কৰিলে তেওঁলোকক প্ৰয়োজন হ'ব
A8.4 দিন
B8 দিন
C7 দিন
D9 দিন
Answer & Solution
Correct answer: A. 8.4 দিন
প্ৰতিদিনে 1/14 + 1/21 = 5/42, গতিকে দেৱালখনৰ বাবে 42/5 = 8.4 days সময় লাগে।
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