book Maths Puzzle Numerical Ability

of 200 coins, 199 are the same weight and ine is lighter than the others. Given the same balance, explain how the lighter coin may be indentfied in no more than 5 weighings.

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I am supposed to solve for x by graphing solution on a number line:

1/3 (absolute value vertical line) 2x-1 (absolute value vertical line) (greater than/equal to symbol) 4 My question is:
9.64 rounded to the nearest thousandth.
would that be 9.6?
Thanks