Question 665374: I am a parent trying to help my son, and I can get the answer, but I don't know how to write it for him, or show him the work. The question is: A tv ad claims that 4L of paint will cover 40m2. How much paint is needed to cover 70M2? I believe the answer is 7L, but I don't know how to show thw work, or write it down.
Found 3 solutions by Alan3354, MathTherapy, bloggauta:
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! A tv ad claims that 4L of paint will cover 40m2. How much paint is needed to cover 70M2?
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Area = 40 sq m/4 L = 10 sq m/Liter
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70/10 = 7 liters
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Or,
4/40 = P/70
cross multiply
40P = 280
P = 7 liters
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website! I am a parent trying to help my son, and I can get the answer, but I don't know how to write it for him, or show him the work. The question is: A tv ad claims that 4L of paint will cover 40m2. How much paint is needed to cover 70M2? I believe the answer is 7L, but I don't know how to show thw work, or write it down.
You can use proportions as it can be said that since 4 represents 40, then what amount of paint, or L, can cover  . This can be written as:
40L = 4 * 70 ------ Cross-multiplying
40L = 280
L, or amount of paint, in liters, that can cover of space =  , or 
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Answer by bloggauta(8)  (Show Source):
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