Question

a hostel spends rs 6400 as cost of wheat for 40 students for 60 days.if they spend rs 4800 for 60 students for how many days will the wheat last??

Answer 1

(40 × 60)/6400 = (60×D)/4800
we'll get D = 30days

Answer 2

Money spent for 40 students for 60 days = 6400

Money spent for 1 student for 1 day = 6400/(40*60) -------(1)

Money spent for 60 students for x days = 4800

Money spent for 1 student for 1 day = 4800/(60x) --------(2)

Equating 1 and 2

6400/(40*60) = 4800/(60x)

64/24 = 80/x

x = 1920/64

x = 30

so wheat will last for 30 days for 60 students if they spend 4800 rupees