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They will know that it is salt because it is 100 wait different

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They will know because the family will know that she changed it because it is a 100 wait difference.

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LOOK BELOW!

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Yes they will noticebecause  it looks different see......

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It is 50 I think

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The difference is 190 grams because I did a time line and measured how much it was to get to 270 grams

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Yes they would notice because the salt would be less than the sugar so her family would  be
suspicious.Also it would weigh less so when her family weighs it it will be lighter than the salt

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I think the family would notice the different because of how much grams there are.

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The salt countiner would be like a few grands heaver. The anser is 50 check my working out:

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You can see my working of this problem below.

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One of the bowls is lighter then the other and the other is heavier so it we'll be good to use the light won and 50 percent chance of using the light won and 20 pecent of using the heavier won