An electrician needs 2 1/2 rolls of electrical wire to wire each room in a house. How many rooms can he wire with 7 1/2 rolls of wire? Write your answer as a fraction or as a whole or mixed number.

If, 2 rolls of electrical wire needed to wire 1 room. So, 1 roll of electrical wire needed to wire = room. Therefore, he can wire of a room with of a roll of wire.

Step-by-step explanation:

He can wire of the room with of a role

Given:

An electrician needs 2 rolls of electrical wire to wire each room in a house.

Now, to find rooms he can wire with 3/5 of a roll of wire.

So, we solve by using unitary method:

If, 2 rolls of electrical wire needed to wire 1 room.

So, 1 roll of electrical wire needed to wire = room.

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.