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<h3>4.4 quarts of paint needed to cover the walls of a room with a perimeter of 55 feet and 8-foot walls</h3>
<em><u>Solution:</u></em>
Given that,
The amount of paint needed to cover the walls of a room varies jointly as the perimeter of the room and the height of the wall
<em><u>The formula for joint variation is: </u></em>
Where,
z is the amount of paint needed
x is the perimter of room
y is the height of room
<em><u>Room with a perimeter of 35 feet and 10 foot high walls requires 3.5 quarts of paint</u></em>
Therefore,
<em><u>find the amount of paint needed to cover the walls of a room with a perimeter of 55 feet and 8-foot walls</u></em>
Substitute k = 0.01, x = 55 and y = 8 in joint variation formula
Thus, 4.4 quarts of paint needed to cover the walls of a room with a perimeter of 55 feet and 8-foot walls