document.write( "Question 209310: I'd have a question; how do I find out how many odd 2 digit numbers are greater than 30? \n" ); document.write( "

Algebra.Com's Answer #158234 by RAY100(1637) $\"\"$ $\"About$

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The 1st odd 2 digit number >30 is,,,,,,31
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\n" ); document.write( "The last odd 2 digit number (less than 100) is,,,,99
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\n" ); document.write( "99-31=68 total number gaps,,,,,divided by 2(odd & even) = 34 number gaps
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\n" ); document.write( "since we are counting 1st and last, add 1 to gap = 35 total numbers
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\n" ); document.write( "checking, 31,33,35,37, 39,,,,,makes 5 numbers for the 30's
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\n" ); document.write( "This repeats for the 40's, 50's, 60's, 70's, 80's,and 90's,,,or 7 times
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\n" ); document.write( "5*7=35 total numbers,,,,ok
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