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A 0.42-kilogram objects would take 10 to make 4.2-kilogram object. Why?

The question is simply asking 4.2 divided by 0.42- which is exactly ten. OR, you could simply count how many decimal places- which is one to the left- multiplying. (Right=divide, left= multiply) So each decimal place is TEN, to that would make sense as well. I hope this helped.

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