Question

cost of 5 dozen apples 720 rupees how many apples can buy in rupees 180

Answer 1

lets compare:

Apples                Rupees
  60 ( 5 dozen)        720
   x                          180

Now cross multiplication

x*720 =60*180
720x = 10800
x       =    10800/720
x       =   15

So 15 apples can be bought in rupees 180

Answer 2

cost of 60 apples = ₹720
apples bought in ₹720=60/720
therefore for ₹1 apples = 60/720
For ₹180 no. of apples = (60÷720)180
= 15 apples