Discuss Forum
1. If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
- A. 17 : 43
- B. 17 : 43
- C. 17 : 43
- D. 17 : 43
Answer: Option A
Explanation:
In 1st metal,
Zinc = 2×(1/3) = 2/3
Copper = 2×(2/3) = (4/3)
In 2nd metal,
Zinc = 3×(1/4) = (3/4)
Copper = 3×(3/4) = (9/4)
New ratio , Zinc : Copper = {(2/3) + (3/4)} :{(4/3) + (9/4)}
= {(8 + 9)/12}:{(16 + 27)/12}
= (17/12):(43/12)
= 17:43 (Ans)
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