Let the daily earnings of Neeta, Geeta, and Sita be represented by the variables \( N \), \( G \), and \( S \) respectively.
From the equation \( N + G = 6S \), we can express \( N \) in terms of \( S \) and \( G \): \[ N = 6S - G \quad \text{......(i)} \]
Substitute the expression for \( N \) from equation (i) into the second equation \( S + N = 2G \): \[ S + (6S - G) = 2G \] Combine like terms: \[ 7S - G = 2G \] \[ 7S = 3G \] Rearrange to express \( G \) in terms of \( S \): \[ G = \frac{7}{3} S \quad \text{......(ii)} \]
Substitute the expression for \( G \) from equation (ii) into equation (i): \[ N = 6S - \frac{7}{3} S \] To subtract these terms, find a common denominator: \[ N = \frac{18}{3} S - \frac{7}{3} S \] \[ N = \frac{11}{3} S \quad \text{......(iii)} \]
The ratio of the daily earnings \( N : G : S \) is: \[ \frac{11}{3} S : \frac{7}{3} S : S \] To simplify, multiply each part of the ratio by 3: \[ 11S : 7S : 3S \] This simplifies to: \[ 11 : 7 : 3 \]
Comparing the ratios, Neeta (\( N \)) earns the most, and Sita (\( S \)) earns the least. The ratio of the earnings of the highest earner to the lowest earner is: \[ N : S = 11S : 3S \] This simplifies to: \[ 11 : 3 \]
The correct option is \( \boxed{(B): 11 : 3} \).