document.write( "Question 774674: If 4 men and 6 boys can finish a piece of work in 24 days, in what time will 8 men and 9 boys finish it supposing that 8men can do as much work in 16 hours as 24boys can do in 12hours?
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document.write( "A.12 days B.13 1/3 days C.15 days D.12 1/2 days \n" );
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Algebra.Com's Answer #472411 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! If 4 men and 6 boys can finish a piece of work in 24 days, \n" ); document.write( "Find the number of men and boy days to complete the work \n" ); document.write( "24(4m) + 24(6b) = (96m + 144b) \n" ); document.write( ": \n" ); document.write( "in what time will 8 men and 9 boys finish it supposing that \n" ); document.write( ": \n" ); document.write( "8 men can do as much work in 16 hours as 24 boys can do in 12 hrs? \n" ); document.write( "16(8m) = 12(24b) \n" ); document.write( "128m = 288b \n" ); document.write( "simplify, divide both sides by 32 \n" ); document.write( "4m = 9b \n" ); document.write( "m = \n" ); document.write( "m = 2.25b \n" ); document.write( ": \n" ); document.write( "(96m + 144b) = the completed job \n" ); document.write( "replace m with 2.25b \n" ); document.write( "96(2.25b) + 144b = \n" ); document.write( "216b + 144b = 360 boy-days to complete the job \n" ); document.write( ": \n" ); document.write( "\"in what time will 8 men and 9 boys finish it \n" ); document.write( "let t = number of days to do the job \n" ); document.write( "8t + 9t = completed job \n" ); document.write( "Change 8 men to boys: 8*2.25 = 18 \n" ); document.write( "18t + 9t = 360 \n" ); document.write( "27t = 360 \n" ); document.write( "t = 360/27 \n" ); document.write( "t = 13.33 days for 8 men and 9 boys to do the job \n" ); document.write( " |