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A part of monthly hostel charge is fixed...

A part of monthly hostel charge is fixed and the remaining depends on the number of days one has taken food in the mess. When Swati takes food for 20 days, she has to pay Rs 3,000 as hostel charges whereas Mansi who takes food for 25 days has to pay Rs 3,500 as hostel charges. Find the fixed charges and the cost of food per day.

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