Question

Jay can remember only the area code and the first 3 digits of his friend's phone number. He also knows that the number has 7 digits (not including the area code) and the last digit is not a zero. If Jay were to dial all of the possible numbers and it takes him 21 seconds to try each one, how many hours would it take him (in total) to try each possibility? 

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Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00 Edition Edition
ISBN: 9780395977224
Author: Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher: McDougal Littell
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