10 men working 5 hours/day earn ₹300. How much money will 15 men working 10 hours/day earn?

₹900

Formula to be used here, 

\(\frac{M_1\;×\;H_1}{M_2\;×\;H_2}\) = \(\frac{E_1}{E_2}\)

where, M = No. of Days, H = No. of Hours, E = Earnings,

⇒ Putting values in the formula,

⇒ \(\frac{10\;×\;5}{15\;×\;10}\) = \(\frac{300}{E_2}\)

⇒ \( { E}_{2 } \) = Rs. 900.