∵ 25 men in 10 days can earn = Rs.1000
∴ 25 men can earn in 1 day \(=\frac{1000}{10}\) = Rs.100
∴ 1 man can earn in 1 day \(=\frac{1000}{25}\)= Rs.4
∵ 1 man can earn in 15 days \(={15}\times{4}\) = Rs.60
∴ 15 man can earn in 15 days \(={60}\times{15}\) = Rs. 900
