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A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the mess

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A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the mess. When student A takes food for 20 days, she has to pay Rs 1000 as hostel charges whereas student B, who takes food for 26 days, pays Rs 1180 as hostel charges. Find the fixed charges and the cost of food per day.