Answer: The different possible solutions are 42, 21, 31 and 80.
Explanation:
The given expression is,

Case 1.



Case 2.


Case 3.



Case 4.


An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. ... Since a triangle's angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.
If .5cm is 2km, then 1 cm is 4 km, and therefore 120/4 is 30, so 30 centimeters on the map