In two alloys A and B the ratio of Zinc and Tin is 5 : 2 and 3 : 4 respectively. 7 kg of the alloy A and 21 kg of the alloy B are mixed together to form a new alloy. What will be the ratio of Zinc and Tin tin the new alloy ?
A. 2 : 1
B. 1 : 2
C. 2 : 3
D. 1 : 1
Answer: Option D
Solution(By Examveda Team)
Zinc | : | Tin | |||
A | 5x | : | 2x | = | 7x |
B | 3y | : | 4y | = | 7y |
x = 1 kg
∴ Zinc in alloy A ⇒ 5kg
Tin in alloy A ⇒ 2 kg
⇒ B ⇒ 7y = 21 kg
y = 3 kg
Zinc in alloy B ⇒ 3 × 3 = 9 kg
Tin in alloy B ⇒ 3 × 4 = 12 kg
∴ After mix - up the ratio of Zinc and Tin in new alloy
$$\eqalign{ & {\text{ Zinc}}:{\text{Tin}} \cr & \,\,\,{\text{A}}\,5\,\,:\,\,\,\,\,2 \cr & \,\,\,{\text{B}}\,9\,\,\,:\,\,\,12 \cr & \overline {{\text{A}} + {\text{B}}:{\text{14}}\,\,\,\,\,{\text{14}}} \cr & \,\,\,\,\boxed{1\,\,\,\,\,:\,\,\,\,\,1} \cr} $$
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