9. A and B can do a piece of workin 72 days: B and C can do it in 120 days; A and C can do it in 90
days. In what days can A alone do it? (Ans.120 days)
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Step-by-step explanation:
लिप्स एंड 105 72 प्लस 1 फोन 120 प्लस 1 फोन 19 दिन सॉल्व सॉल्व इट बाय डिवाइडिंग द वैल्यू ऑफ एक्स
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