alleryਇੱਕ ਦਰਜ਼ੀ 20 ਦਿਨਾਂ ਵਿੱਚ ਇੱਕ ਬੈਚ ਸਿਲਾਈ ਕਰਦੀ ਹੈ, ਉਸਦੀ ਸਾਥੀ 30 ਦਿਨਾਂ ਵਿੱਚ। ਇਕੱਠੇ ਉਹ ਖਤਮ ਕਰਦੇ ਹਨ
A25 ਦਿਨ
B12 ਦਿਨ
C10 ਦਿਨ
D15 ਦਿਨ
Answer & Solution
Correct answer: B. 12 ਦਿਨ
ਉਹਨਾਂ ਦੀ ਸੰਯੁਕਤ ਦਰ 1/20 + 1/30 = 5/60 = 1/12 ਪ੍ਰਤੀ ਦਿਨ ਹੈ, ਜਿਸ ਨਾਲ 12 ਦਿਨ ਮਿਲਦੇ ਹਨ।
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