Answer:
0.2 on the plan
Explanation:
The unit is not given, so whatever the unit is will follow. I'm going to say that it is in meters.
25 meters in real life=1 inch (just a guess) on the plan.
25÷5 (the room length given) = 5
1÷5=0.2
You divide them both by the same number so your ratio can have the same rate. Hope this helps.