Discussion

Explanation:

Let the required wages be Rs. x.

More men, More wages ⇒ wages ∝ men    (Direct Proportion)

Less days, Less wages ⇒ wages ∝ days    (Direct Proportion)

⇒ wages ∝ men × days

⇒ $\frac{wages}{men\times days}$ = constant

⇒ $\frac{4200}{6\times 15}=\frac{x}{9\times 12}$

⇒ x = 5040

∴ the required wages are Rs. 5040.

Hence, 5040.

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