I am a multiple of 70 I am between 300 and 500 I am 20 more than a multiple of 100 who am I?
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There are two ways you can go about this. If you know the 3-4-5 triangle, and you multiply by 3, you will get a 6-8-10 triangle, so the missing length is 6. You can also simply us the pythagorean theorem.