Posted by **justin** on Monday, January 28, 2013 at 11:50pm.

The number of Roberto's baseball cards is 3/4 the number of David's cards. If Roberto gives 1/2 of his cards to David, what will be the ratio of Roberto's cards to David's cards?

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**Steve**, Tuesday, January 29, 2013 at 11:04am
r = 3d/4, or 4r = 3d

r/2 / (3d/4 + r/2) = 2r/(3d+2r) = 2r/6r = 1/3

check:

If Roberto has 12 cards, David has 16

After Robert gives David 6,

6/18 = 1/3

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**Kaha**, Wednesday, January 22, 2014 at 6:05pm
??

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**Anonymous**, Monday, January 12, 2015 at 5:20pm
the number of roberto's baseball cards is 3/4 the number of david's cards. if roberto gives 1/2 of his cards to david, what will be the ratio of roberto's cards to david's cards?

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**Anonymous**, Wednesday, March 25, 2015 at 3:06pm
hi

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