Question

an electrician needs 2 rolls of electrical wire to wire each room in a house.How many rooms can he wire with 3/5 of a roll of wire.

Answer 1

He can wire
`(3)/(10)` of a room with
`(3)/(5)` of a roll of wire.

Explanation:

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 =
`(1)/(2)` room.

Thus,
`(3)/(5)` roll of electrical wire needed to wire =
`(1)/(2) * (3)/(5)` =
`(3)/(10) \ room.`

Therefore, he can wire
`(3)/(10)` of a room with
`(3)/(5)` of a roll of wire.