document.write( "Question 830991: How many 2-digit numbers less than 60 are even? \n" ); document.write( "
Algebra.Com's Answer #501055 by Edwin McCravy(20055)\"\" \"About 
You can put this solution on YOUR website!
How many 2-digit numbers less than 60 are even?
\n" ); document.write( "
\r\n" );
document.write( "I'll show you two ways.\r\n" );
document.write( "\r\n" );
document.write( "The way you do this depends on whether you are studying\r\n" );
document.write( "arithmetic sequences or not.  If you are not, then do\r\n" );
document.write( "it this way:\r\n" );
document.write( "\r\n" );
document.write( "The smallest is 20 and the largest is 58\r\n" );
document.write( "\r\n" );
document.write( "Those numbers go like this: \r\n" );
document.write( "\r\n" );
document.write( "               20,22,24,...,54,56,58\r\n" );
document.write( "\r\n" );
document.write( "The numbers that are halves of those numbers go like this\r\n" );
document.write( "\r\n" );
document.write( "               10,11,12,...,27,28,29\r\n" );
document.write( "\r\n" );
document.write( "The numbers that are 9 less than those numbers go like this\r\n" );
document.write( "\r\n" );
document.write( "               1 , 2, 3,...,18,19,20\r\n" );
document.write( "\r\n" );
document.write( "Answer: 20.\r\n" );
document.write( "\r\n" );
document.write( "-------------------\r\n" );
document.write( "\r\n" );
document.write( "If you are taking algebra and studying arithmetic sequences, then\r\n" );
document.write( "do it this way:\r\n" );
document.write( "\r\n" );
document.write( "an = a1 + (n-1)d\r\n" );
document.write( "\r\n" );
document.write( "an = 58, a1 = 20, d=2\r\n" );
document.write( "\r\n" );
document.write( "58 = 20 + (n-1)(2)\r\n" );
document.write( "\r\n" );
document.write( "38 = 2(n-1)\r\n" );
document.write( "\r\n" );
document.write( "Divide both sides by 2\r\n" );
document.write( "\r\n" );
document.write( "19 = n-1\r\n" );
document.write( "\r\n" );
document.write( "20 = n\r\n" );
document.write( "\r\n" );
document.write( "Answer = 20.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );