In a garrison, there was food from 500 soldiers for forty days.After 15 days, 200 soldiers left the garrison. After 15 more days, 200 soldiers left the garrison. How long did the soldiers were able to live with the food supplies?

In a garrison, there was food from 500 soldiers for forty days.After 15 days, 200 soldiers left the garrison. After 15 more days, 200 soldiers left the garrison. How long did the soldiers were able to live with the food supplies?
1). 30
2). 70
3). 80
4). 110

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