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In two alloys A and B, the ratio of zinc to tin is 5 : 2 and 3 : 4 respectively. Seven 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 in the new alloy ?
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- 2 : 1
- 1 : 2
- 2 : 3
- 1 : 1
Correct Option: D
In 7 kg of alloy A,
Zinc = 5 kg, Tin = 2 kg
In 21 kg of alloy B
| Zinc = | = 9 kg | |
| 7 |
| Tin = | = 12 kg | |
| 7 |
∴ Required ratio
= (5 + 9) : (2 + 12) = 14 : 14
or 1 : 1
