Question
Fred, Vaidev and Howard have some cards. The ratios of their cards are as follows:

Fred : (Fred + Vaidev + Howard) = 3 : 7
Vaidev : (Fred + Howard) = 1 : 3

Howard has 20 cards more than Vaidev. In the end, Howard gives away all he has to Vaidev and Fred so that both Vaidev and Fred end up with the same number of cards, how many cards has Fred received from Howard?
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Fred, Vaidev and Howard have some cards. The ratios of their cards are as follows:

Fred : (Fred + Vaidev + Howard) = 3 : 7
Vaidev : (Fred + Howard) = 1 : 3

Howard has 20 cards more than Vaidev. In the end, Howard gives away all he has to Vaidev and Fred so that both Vaidev and Fred end up with the same number of cards, how many cards has Fred received from Howard?