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[" 4.The ages of A and B are in the rati...

[" 4.The ages of A and B are in the ratio "5:7." Four years from now the ratio of their ages whil "],[3:4" .The present age of B is is .Four years from now the ratio of their ages whil "],[3:4" .The present age of B is "],[[" (a) "20" yearsent age of "," bis "," (c) "15" vears "," (d) "21" years "]]

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