JEE Advanced Model Paper 3 with solutions for online practice

A hotel complex has 400 two bed room apartments, has 300 of them rented andthe rent is Rs 360 per day. Management's research indicates that the rent isreduced by x rupees, then the number of apartments rented q will be
q =

5x

4

+ 300 where 0 ≤ x ≤ 80 then