Three-digit numbers

How many three-digit numbers are not closer to 600 on the number axis than to 400?

Correct answer:

n =  499

Step-by-step explanation:

l1=x600 l2=x400  l1<l2 x<1000  x>400 600x<x400 600<2x400 1000<2x x>500  x>=600 x600<x400 600<2x400 1000<2x 500<x  500<x<1000  n=10005001=499

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