Smith and Johnson together can do a piece of work in 4 days. If they had to work separately, the time taken by Johnson to do work would be more than that of Smith by 6 days. In how many days can smith alone do the work?​

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.