If a room needs 7 rolls of wire, how much will 7/10 of 1 roll do

1/10th of the room

Step-by-step explanation:

Step 1:

Given that one room needs 7 rolls of wire.

We need to find how much will 7/10 of 1 roll will do

Step 2:

7 rolls of wire does 1 room, so we have

1 roll of wire will do 1/7 of the room

We can see that as the number of roll increases, the size of the room also increases and when the number of roll decreases the size of the room decreases. So this is a case of direct proportion.

Step 3:

Using direct proportion we have,

1 roll of wire does 1/7 of the room, so

7/10 of one roll of wire will do 7/10 * 1/7 = 1/10th of the room