Alloy A contains copper and zinc in the ratio of 4 : 3 and alloy B contains copper and zinc in the ratio of 5 : 2. A and B are taken in the ratio of 5 : 6 and melted to form a new alloy. The percentage of zinc in the new alloy is closest to:
A. 54
B. 34.2
C. 36.8
D. 35
Answer: Option D
Solution(By Examveda Team)
\[\begin{array}{*{20}{c}} {{\text{Copper}}}&{}&{{\text{Zinc}}}&{} \\ 4&:&3&{ \Rightarrow {7_{ \times 5}}} \\ 5&:&2&{ \Rightarrow {7_{ \times 6}}} \end{array}\]\[\begin{array}{*{20}{c}} {{\text{Copper}}\,\,\,\,\,{\text{Zinc}}} \\ {20\,\,\,\,\,:\,\,\,\,\,15} \\ {30\,\,\,\,\,:\,\,\,\,\,12} \\ {\overline {\,50\,\,\,\,\,:\,\,\,\,\,27\,} } \end{array}\]
$${\text{Zinc }}\% = \frac{{27}}{{77}} \times 100 = 35\% $$
Related Questions on Ratio
If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to
A. 2 : 1
B. 14 : 3
C. 7 : 2
D. 1 : 2
If $$\frac{2}{3}$$ of A=75% of B = 0.6 of C, then A : B : C is
A. 2 : 3 : 3
B. 3 : 4 : 5
C. 4 : 5 : 6
D. 9 : 8 : 10
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