document.write( "Question 315378: 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 20 drinks? \n" ); document.write( "
Algebra.Com's Answer #225656 by ankor@dixie-net.com(22740)\"\" \"About 
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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 20 drinks?
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\n" ); document.write( "let t = time required when they all worked together
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\n" ); document.write( "Let the completed job = 1 (the mixing of 20 drinks)
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\n" ); document.write( "\"t%2F5\" + \"t%2F10\" + \"t%2F15\" = 1
\n" ); document.write( "Multiply by 30, results
\n" ); document.write( "6t + 3t + 2t = 30
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\n" ); document.write( "11t = 30
\n" ); document.write( "t = \"30%2F11\"
\n" ); document.write( "t = 2.73 minutes, or 2 min 44 sec
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\n" ); document.write( "Check solution using a calc
\n" ); document.write( "\"2.73%2F5\" + \"2.73%2F10\" + \"2.73%2F15\" =
\n" ); document.write( ".546 + .273 + .182 = 1.00
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