A garrison of 1000 men had provisions for 48 days. However, a reinforcement of 600 men arrived. How long will now food last for?

∵ For 1000 men, provision lasts for 48 days.
∴ For 1 men, provision lasts for (48 x 1000) days.
∴ For (1000 + 600) men, provision will last for (48 x 1000)/1600 days.
∴ Required number of days = (48 x 1000)/1600 = 3 x 10 = 30