book Maths Puzzle Numerical Ability

My question is:
9.64 rounded to the nearest thousandth.
would that be 9.6?
Thanks

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book Other Question

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. The sum of the digits of a two digit number is 9. if the digits were reversed the new number would be 9 more than the original number. find the original number.