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Tea-Is-God
John and Alan have have a collection of X baseball cards. john has x/4 cards. what fraction of the cards does Alan have?
total of X cards are there, wherein X/4 is taken by john therefore fraction that Alan has is \[X-\frac{ X }{ 4 }=\frac{ 4X-X }{ 4 }=\frac{ 3X }{ 4 }\]