Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Quantitative Aptitude Percentage

If 20% of (a + b) = 50% of ab and 40% of (a - b) = 70% of ab, then what fraction of a is b?

1
\(\frac{3}{{17}}\)
2
\(\frac{-3}{{17}}\)
3
\(\frac{4}{{17}}\)
4
\(\frac{17}{{3}}\)
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