Number of rooms can be wired by electrician is approximately 3
Solution:
Given that electrician needs
rolls of electrical wire to wire each room in a house
To find: number of rooms can he wire with
rolls of wire
From given information,
Rolls of wire needed for 1 room =

Total rolls of wire =

So number of rooms can be wired:



Thus number of rooms can be wired is
or approximately 3 rooms