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Explanation:

Let the earnings of Neeta, Geeta and Sita be ‘n’, ‘g’ and ‘s’ respectively.

The amount Neeta and Geeta together earn in a day equals what Sita alone earns in 6 days
⇒ 6s = n + g   …(1)

The amount Sita and Neeta together earn in a day equals what Geeta alone earns in 2 days
⇒ 2g = s + n
⇒ 2(6s – n) = s + n [From (1)]
⇒ 11s = 3n
⇒ n = 11s/3   …(2)

Substituting n = 11s/3 in (1)

⇒ 6s = 11s/3 + g
⇒ 7s/3 = g   …(3)

From (2) and (3)
11s/3 > 7s/3 > s

∴ n > g > s

∴ The ratio of the daily earnings of the one who earns the most to that of the one who earns the least is = 11s/3 : s = 11 : 3

Hence, option (c).