A hostel has food provisions of 28 days for 100 students. If 20 students leave the hostel then how long will the same food provisions last?
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Answer:
=S _ D
=100 _ 28
=80 _?(x)
=100/80=X/28
=5/4=x/28
=x=5/4×28
=X=5×7
=x=35 day
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