Question

for 20 students the mess bill for 12 days is rs7000. in how many days will the mess charges be rs 4900 for 8 students?

Answer 1

the mess charges Rs. 7000 for 20 students in 12 days
therefore ;one day bill for 20 students =7000÷12=583.34

Now ,
bill for one student =583.34÷20
=29.167. therefore bill for 8 students for a day. = 29.167×8
=233.336

Now
total amount of bill = bill of a day ×no of days
therefore ,no. of days =4900÷233.336
=20.99
=21 days

Answer 2

for 1 student = 29.16

for 8 students= 29.16×8=233.33

as per the problem

4900÷233.33

=20.99

21days