need help

 

   All members of our painting team paint at the same rate.     

   If 20 members can paint a 2000 square foot wall in 40 minutes, then how long     

   would it take the 20 members to paint a 6000 square foot wall, in minutes?     

 

   20 mem   ==>>    paint 2000 ft² / 40 min  =  50 ft²/min     

   20 mem   ==>>    paint 6000 ft² /    x         =  50 ft²/min     

                                        6000 ft²                 =  50 ft²/min • x     

                                        6000 ft² / 50 ft²/min  =  x             

                                                                             x  =  120 min     

 

   Another way to do it is to consider the 6000 ft² wall as equivalent to three 2000 ft² walls     

   So, because one wall takes 40 minutes, three walls would take 3 • 40 min = 120 min     

   .