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ksb
 Post subject: QOTW : Number Properties
PostPosted: Wed Apr 29, 2009 8:00 am 
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Joined: Tue Dec 28, 2004 2:34 am
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How many digits does the product of 4^12 and 5^23 contain?
A. 12
B. 13
C. 23
D. 24
E. 35

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ksb
 Post subject: Re: QOTW : Number Properties
PostPosted: Tue May 05, 2009 3:48 am 
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Joined: Tue Dec 28, 2004 2:34 am
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The correct answer is choice D.

We can rewrite the given numbers as 2^24 * 5^23.
i.e., 2 * 2^23 * 5^23
= 2 * 10^23.
This is a 24 digit number.

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