Ritchie wants to paint his bedroom ceiling and four walls. both the ceiling and walls are 8 by 8 feet. a gallon of paint covers 40 square feet. which expression can be used to find the number of gallons of paint ritchie needs to buy?

Option C is correct.

Number of gallons of paint Ritchie needs to buy;  

Step-by-step explanation:

Unit rate defined as the rates are expressed as a quantity as 1 such as 8 miles per hour or 5 meter per second.

As per the statement: Ritchie wants to paint his bedroom ceiling and four walls. Both the ceiling and walls are 8 by 8 feet.  

Area of four wall = square feet

also;

Area of ceiling = square feet

Total area of ceiling and four walls = square feet.  {Using distributive property }

Also, it is given a gallon of paint cover 40 square feet.

⇒Unit rate per area = gallon of paint

We have to find the number number of gallons of paint.

Substitute the given values we get;

Inverse of Multiplication operation is Division.

Therefore, number of gallons of paint Ritchie need to buy is,

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step-by-step explanation:

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step-by-step explanation: