document.write( "Question 450613: Please help me solve this!\r
\n" ); document.write( "\n" ); document.write( "\"Erica could do 10 math problems in 20 minutes. Penny could do 15 math problems in 25 minutes. If they worked together, how many minutes would it take Erica and Penny to do 30 math problems?\"\r
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Algebra.Com's Answer #309937 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "\"Erica could do 10 math problems in 20 minutes OR 10/20 = .5 in 1 min
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document.write( "Penny could do 15 math problems in 25 minutes OR 15/25 = .6 in  1 min
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document.write( "If they worked together... 
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document.write( "how many minutes would it take Erica and Penny to do 30 math problems?\"
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document.write( "Let x represent the amount of minutes
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document.write( " .5x + .6x = 30
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document.write( "       1.1x = 30
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document.write( "          x = 30/1.1 =  27.2727 minutes\r
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