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How many integers between 324,700 and 458,600 have tens [#permalink]
 11 Apr 2006, 08:53
How many integers between 324,700 and 458,600 have tens digit 2 and units digit 1?
1,339
1,352
1,353
10,030
10,300
PLEASE EXPLAIN the concept. I'm not sure how to do these type of problems. Thanks. 
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Senior Manager
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Re: Challenge Question [#permalink]
11 Apr 2006, 09:19
Is the answer A. ? 1339?
If so then I will explain it.
(I assume that the Q ask for both together tens digit 2 and units digit 1)
yach wrote: How many integers between 324,700 and 458,600 have tens digit 2 and units digit 1? 1,339 1,352 1,353 10,030 10,300 PLEASE EXPLAIN the concept. I'm not sure how to do these type of problems. Thanks. |
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Re: Challenge Question [#permalink]
11 Apr 2006, 09:40
Yup, OA is A. Please help.
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Re: Challenge Question [#permalink]
11 Apr 2006, 09:54
A.
458,600-324,700 =133,900
tens digit 2 and units digit 1 this mean 21, this number will appear once in every 100.
133900/100 = 1339
yach wrote: Yup, OA is A. Please help.
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Re: Challenge Question [#permalink]
11 Apr 2006, 10:19
SunShine wrote: A. 458,600-324,700 =133,900 tens digit 2 and units digit 1 this mean 21, this number will appear once in every 100. 133900/100 = 1339 yach wrote: Yup, OA is A. Please help. Great explanation. 
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Director
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Re: Challenge Question [#permalink]
11 Apr 2006, 11:20
SunShine wrote: A. 458,600-324,700 =133,900 tens digit 2 and units digit 1 this mean 21, this number will appear once in every 100. 133900/100 = 1339 yach wrote: Yup, OA is A. Please help. Bravo!!!!10x very useful
_________________
IE IMBA 2010
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How many integers between 324,700 and 458,600 have tens digit 2 and units digit 1?
1,339
1,352
1,353
10,030
10,300
number should be ending with 21
we get 21 after every 100 nos
so, answer is (458600-324700)/100 = 1339
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