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If 3% of (a + b) = 7% of (ab) and 5% of (a – b) = 4% of (ab) then what percentage of b is a?

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If 3% of (<em>a </em>+ <em>b</em>) = 7% of (<em>ab</em>) and 5% of (<em>a </em>– <em>b</em>) = 4% of (<em>ab</em>) then what percentage of <em>b </em>is <em>a</em>?






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