document.write( "Question 285456: If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks? \n" ); document.write( "
Algebra.Com's Answer #207155 by scott8148(6628)\"\" \"About 
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in the combined time (x), they each mix a FRACTION of the 20 total drinks\r
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\n" ); document.write( "\n" ); document.write( "Steve mixes ___ x/5\r
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\n" ); document.write( "\n" ); document.write( "the fractions sum to one (the whole)\r
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\n" ); document.write( "\n" ); document.write( "(x / 5) + (x / 10) + (x / 15) = 1\r
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\n" ); document.write( "\n" ); document.write( "6x + 3x + 2x = 30 ___ x = 30/11\r
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\n" ); document.write( "\n" ); document.write( "this is a mathematical solution; since each person would most likely mix a whole number of drinks (not 2/3 of a drink),
\n" ); document.write( "the number is a good approximation to REALITY
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