7. A hostel spends 3200 on food for 20 students for 30 days. If they spend * 2400 for 30 students, then for how many days will the food last?
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Rs. 3200 for 20 students for 30 days so per student per day expenditure is 3200/(20×30) = 5.333 Rs. So one day's expense for 30 students= 5.333×30= 160 Rs.
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