In two alloys A and B, the ratio of copper and zinc is 5 : 2 and 3 : 4 respectively. 7 kg of alloy A and 21 kg of the alloy B are mixed together to form a new alloy. What will be the ratio of copper and zinc in the new alloy ?दो मिश्र धातुओं A तथा B में, ताँबा तथा जस्ता का अनुपात क्रमशः 5 : 2 तथा 3 : 4 है, इन मिश्र धातुओं में से A का 7 किग्रा एवं B का 21 किग्रा मिलाकर एक नई मिश्र धातु बनाई जाती है, इस नई मिश्र धातु में ताँबे तथा जस्ता का अनुपात क्या है ?
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Correct answer: D. 1 : 1
Explanation
In 7 kg of A: copper = 7 x 5/7 = 5 kg, zinc = 2 kg. In 21 kg of B: copper = 21 x 3/7 = 9 kg, zinc = 12 kg. Total copper = 14 kg and total zinc = 14 kg, so the ratio is 14 : 14 = 1 : 1. Hence the answer is 1 : 1.A के 7 किग्रा में: ताँबा = 7 x 5/7 = 5 किग्रा, जस्ता = 2 किग्रा। B के 21 किग्रा में: ताँबा = 21 x 3/7 = 9 किग्रा, जस्ता = 12 किग्रा। कुल ताँबा = 14 किग्रा और कुल जस्ता = 14 किग्रा, अतः अनुपात 14 : 14 = 1 : 1। अतः उत्तर 1 : 1 है।More Mathematics & Numerical Ability questions
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