alleryIf 30% of (A - B) = 25% of (A + B), then B is what percent of A?
Aabout 36%
Babout 18%
Cabout 27%
Dabout 9%
Answer & Solution
Correct answer: D. about 9%
1. 0.30(A - B) = 0.25(A + B).
2. 0.30A - 0.30B = 0.25A + 0.25B.
3. 0.05A = 0.55B.
4. B/A = 0.05/0.55 = 1/11.
5. So B is about (1/11)*100 = 9.09% of A.
_Source: SSC CGL Quantitative Aptitude (Percentages), R.S. Aggarwal style and standard practice_
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