Answer :

Let the distance measured on map be x cm


The above information in the form of table is as follows:



The above information is in direct proportion because distance covered in cm will increase or decrease with distance covered in km.


Therefore,


1 × 18 = x × 72


 x = 4 cm
Method 2:
1 cm on map = 18 km on road
1 km on road = 1/18 cm on map
72 km on road = 1/18 × 72 cm on map = 4 cm on map.

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