Question
Tom, Carl and David have some pens. The ratios of their pens are as follows:

Tom : (Tom + Carl + David) = 1 : 5
Carl : (Tom + David) = 1 : 3

David has 18 pens more than Carl. In the end, David gives away all he has to Carl and Tom so that both Carl and Tom end up with the same number of pens, how many pens has Tom received from David?
4 m

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Tom, Carl and David have some pens. The ratios of their pens are as follows:

Tom : (Tom + Carl + David) = 1 : 5
Carl : (Tom + David) = 1 : 3

David has 18 pens more than Carl. In the end, David gives away all he has to Carl and Tom so that both Carl and Tom end up with the same number of pens, how many pens has Tom received from David?