Explanation:
We can start the problem by finding how much wire is needed to wire one room.
If 3/5 of wire is needed to wire one room, then we can write:
1 room = 3/5 of wire
To find out how many rooms can be wired with 3 3/5 of wire, we can divide the total amount of wire by the amount of wire needed for one room:
3 3/5 ÷ 3/5 = (18/5) ÷ (3/5) = (18/5) × (5/3) = 6
Therefore, the electrician can wire 6 rooms with 3 3/5 of wire.