Question

A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the match when bhavana takes food for 20 days she has to pay rupees 2600 as hostel charges whereas when they are text food for 26 days she paid rupees 30 20 and hostel charges find the fixed charges and the cost of food per day

Answer 1

Let the fixed charge be x and every food cost be y
thus
x+20y=2600 (1)
x+26y=3020 (2)
__________
-6y=-420
y=70
x=1200