document.write( "Question 938373: Sara wants to paint the wood around 4 windows in her house. She thinks that she can paint each window in 90% of the time it took to paint the previous window. If it takes her 30 minutes to paint the first window, how long will it take to paint all 4 windows. Please help me to solve this kind of math problem thanks in advance ))) \n" ); document.write( "
Algebra.Com's Answer #571610 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "30 minutes for the 1st window\r\n" );
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document.write( "PLUS\r\n" );
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document.write( "90% of 30 minutes = .90(30) = 27 minutes for the 2nd window\r\n" );
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document.write( "PLUS\r\n" );
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document.write( "90% of 27 minutes = .90(27) = 24.3 minutes for the 3rd window\r\n" );
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document.write( "PLUS\r\n" );
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document.write( "90% of 24.3 minutes = .90(24.3) = 21.87 minutes for the 3rd window.\r\n" );
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document.write( "Add them up: \r\n" );
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document.write( " 30\r\n" );
document.write( " 27\r\n" );
document.write( " 24.3\r\n" );
document.write( " 21.87\r\n" );
document.write( "------\r\n" );
document.write( "103.17\r\n" );
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document.write( "Divide that by 60\r\n" );
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document.write( "     1.7195\r\n" );
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document.write( "60)103.1700\r\n" );
document.write( "    60\r\n" );
document.write( "   ---\r\n" );
document.write( "    43 1\r\n" );
document.write( "    42 0\r\n" );
document.write( "    ----\r\n" );
document.write( "     1 17\r\n" );
document.write( "       60\r\n" );
document.write( "     ----\r\n" );
document.write( "       570\r\n" );
document.write( "       540\r\n" );
document.write( "       ----\r\n" );
document.write( "        300\r\n" );
document.write( "        300\r\n" );
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document.write( "Multiply 0.7195 by 60, get 43.17\r\n" );
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document.write( "1 hour 43.17 minutes\r\n" );
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document.write( "Edwin
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