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prelims Test Series 2019
बेसिक इंग्लिश का दूसरा सत्र (कक्षा प्रारंभ : 22 अक्तूबर, शाम 3:30 से 5:30)
Weekend Puzzle (Jun 11, 2016)

To make a given amount of an alloy with 60% purity of Copper, 90 kg copper is required. How much of copper would be required to make twice the amount of alloy with 70% purity?

(a) 200 kg
(b) 210 kg
(c) 420 kg
(d) 105 kg

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