If in a hostel, food is available for 45 days for 50 students. For how many soldiers for 75 students?

∵ For 50 students, food is sufficient for 45 days.
∴ For 1 students, food is sufficient for 45 x 50 days.
∴ For 75 students, food is sufficient for (45 x 50)/75 days i.e., for 30 days .