Question

In a hostel mess 250 boys have provision for 35 days .if after 7 days 30 more boys join then how long will be
the provision last

Answer 1

250×28=280×x
7000=280×x
7000/280=x
x=25

Answer 2

Answer

Let X be the number of days provision last

250×(35-7)=(250+30)×X

250×28=280×X

X=7000÷280=25

Thus,provision will last for 25 days