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3/10=x/100 what is x

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1 Answer

Hi Angelica;
The short way, I can see immediately that x=30.
The long way...
3/10=x/100
Let's cross-multiply...
(3)(100)=300
(10)(x)=10x
300=10x
Let's divide both sides by 10...
300/10=10x/10
30=x

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