Let the incomes of D and E be $x$ and $y$ respectively. Find $x-y$. (I) $0.72x - 0.5y = 3200$ (II) $0.4x - 0.4y = 8000$ A) Only I B) Only II C) Both I and II D) Either I or II

Only I
Only II
Both I and II
Either I or II

Correct answer: Only II

Solution

Statement I alone gives one equation in two variables, so it cannot determine $x-y$ uniquely. Statement II simplifies to $0.4(x-y)=8000$, which gives $x-y=20000$ directly. Hence, only II is sufficient.

Related IBPS PO Quantitative Aptitude questions

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