Given: Number of person (M1)=6 Per day work (H1)=8hours Money earn = Rs. 1680 Number of person (M2)=9 Per day work (H2)=6hours Concept used: (M1×H1)/W2=(M2×H2)/W2 Where, M1 → First type of men H1 → Per days working hours by first type men W1 → Wages of first type men M2 → Second type of men H2 → Per days working hours by second type men W2 → Wages of the second type men Calculations: (M1×H1)/W2=(M2×H2)/W2 ⇒ (6 × 8)/1680 = (9 × 6)/W2 ⇒W2 = (54 × 1680)/48 = Rs. 1890 ∴ The 9 men working 6 hours a day will earn Rs. 1890 per week