If 20% of (a + b) = 50% of (ab) and 40% of (a – b) = 7 - Exam Yatra

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UGC NET November 2020 (Paper - I)
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If 20% of (a + b) = 50% of (ab) and 40% of (a – b) = 70% of ab, then what fraction of a is b?

[UGC NET November 2020 (Paper - I)]

A

B

C

D

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