If 15 boys earn ₹ 750 in 5 days, then how much money is 25 boys will earn in 6 days?

Correct option is B

Given:
- 15 boys earn ₹750 in 5 days
- Number of boys = 25
- Number of days = 6

Formula Used:
Earnings are directly proportional to the number of boys and the number of days.
So, Earnings ∝ Number of boys × Number of days

Solution:
Let the earnings of 25 boys in 6 days be ₹x.

Using proportionality:
​$$15 \times 5 : 25 \times 6 = 750 : x \\\ \\\Rightarrow \frac{15 \times 5}{25 \times 6} = \frac{750}{x} \\\ \\\Rightarrow \frac{75}{150} = \frac{750}{x} \\\ \\\Rightarrow \frac{1}{2} = \frac{750}{x} \\\ \\\Rightarrow x = 750 \times 2 = ₹1500$$​​

Hence, 25 boys will earn ₹1500 in 6 days.