In two alloys the ratios of copper to tin are 3 : 4 and 1 : 6 respectively. If 7 kg of the first alloy and 21 kg of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is:

In two alloys the ratios of copper to tin are 3 : 4 and 1 : 6 respect

1.	In two alloys the ratios of copper to tin are 3 : 4 and 1 : 6 respectively. If 7 kg of the first alloy and 21 kg of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is:
A.	3 : 11
B.	1 : 4
C.	3 : 7
D.	4 : 11
Answer» B. 1 : 4

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In two alloys the ratios of copper to tin are 3 : 4 and 1 : 6 respectively. If 7 kg of the first alloy and 21 kg of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is:

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