Question:
If 25 men earn Rs 1000 in 10 days, how much will 15 men earn in 15 days?
Solution:
Earnings of 25 men in 10 days $=$ Rs. 1000
$\therefore$ Earnings of 25 men in 1 day $=$ Rs. $\frac{1000}{10}=$ Rs. 100
$\therefore$ Earning of 1 man in 1 day $=$ Rs. $\frac{100}{25}=$ Rs. 4
$\therefore$ Earnings of 1 men in 15 days $=$ Rs. $(15 \times 4)=$ Rs. 60
$\therefore$ Earnings of 15 men in 15 days $=$ Rs. $(60 \times 15)$
$=$ Rs. 900