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)![]() ![]() You can put this solution on YOUR website! 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( ": \n" ); document.write( "let t = time required when they all worked together \n" ); document.write( ": \n" ); document.write( "Let the completed job = 1 (the mixing of 20 drinks) \n" ); document.write( ": \n" ); document.write( " \n" ); document.write( "Multiply by 30, results \n" ); document.write( "6t + 3t + 2t = 30 \n" ); document.write( ": \n" ); document.write( "11t = 30 \n" ); document.write( "t = \n" ); document.write( "t = 2.73 minutes, or 2 min 44 sec \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Check solution using a calc \n" ); document.write( " \n" ); document.write( ".546 + .273 + .182 = 1.00 \n" ); document.write( " |