A certain alloy contains Lead, copper, and tin. How many pounds of tin are in 56 pounds of the alloy?

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A certain alloy contains Lead, copper, and tin. How many pounds of tin are in 56 pounds of the alloy?

(1) By weight, the alloy is 3/7 lead and 5/14 copper.
(2) By weight the alloy is 6 parts lead and 5 parts copper.

[spoiler]OA=A[/spoiler]

Source: Official Guide
Source: — Data Sufficiency |