[latex]\frac {p}{250}[/latex] = [latex]\frac {q}{650}[/latex] = [latex]\frac {r}{200}[/latex] = [latex]\frac {p + q + r}{250 + 650 + 200}[/latex]

Thus p + q + r = 682

⇒ q = 403 ml.

Therefore,

[latex]\frac {4x + 25}{7x + 25} = \frac {3}{5}[/latex]

5(4x + 25) = 3(7x + 25)

20x + 125 = 21x + 75

x = 50

Therefore, their salaries are 4 × 50 and 7 × 50 i.e., 200 and 350

Choice (C) 30 and 20 are in the ratio of 6:4

Five years ago their ages would be 25 and 15 which are in the ratio 5:3.

Hence choice (C) is the right answer.

As A takes 6 days to complete the job, if A works alone, A will be able to complete [latex]{\frac {1}{6}}^{th}[/latex] of the work in a day.

Similarly, B will complete [latex]{\frac {1}{8}}^{th}[/latex] and C will complete [latex]{\frac {1}{12}}^{th}[/latex] of the work.

So, the ratio of the work done by A:B:C when they work together will be equal to [latex]\frac {1}{6}[/latex], [latex]\frac {1}{8}[/latex], [latex]\frac {1}{12}[/latex]

Multiplying the numerator of all 3 fractions by 24, the LCM of 6, 8 and 12 will not change the relative values of the three values

We get [latex]\frac {24}{6}[/latex], [latex]\frac {24}{8}[/latex], [latex]\frac {24}{12}[/latex] = 4 : 3 : 2

i.e., the ratio in which A:B:C will share Rs.2340 will be 4 : 3 : 2.

Hence, C’s share will be 29 × 2340 = Rs 520

Had the ratio of expenditures been 3:5, ratio of savings also would have been 3:5, but since ratio of their expenditures is 3:4.5 only. Obviously savings of Gauri will be something more than [latex]\frac {5}{3}[/latex] of savings of Pankaj.

Thus Gauri is the answer.

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