Answer:
Answer to Question 1: 5/28
Answer for Question 2: 4 Rooms
Step-by-step explanation for Question 1:
The reciprocal is basically inverting the number in a fractions.
5 3/5 will convert to: 5/5 + 5/5 + 5/5 + 5/5 + 5/5 +3/5 =28/5
Invert 28/5 and you'll get 5/28 which is the answer
Step-by-step explanation for Question 2:
This one might seem a little over whelming the way I explain it so bare with me :)
Convert 8 4/5 and 2 1/5 the same way as Question 1
8 4/5= 5/5 + 5/5 + 5/5 + 5/5 + 5/5 + 5/5 + 5/5 + 5/5 + 4/5
2 1/5= 5/5 +5/5 + 1/5
When grouping them together you get 4 groups of 2 1/5 (aka:5/5 +5/5 + 1/5)
Hence why the answer is 4 rooms.
I hope this helps :)