All members of our painting team paint at the same rate. If $20$ members can paint a $2000$ square foot wall in $35$ minutes, then how long would it take the $20$ members to paint a $5000$ square foot wall, in minutes?
Note that each member of the team paints 2000/20=100 square feet per minute at this rate. It will take them 5000/100 = 50 minutes to paint a 5000 square foot wall.
