Consider a tank containing 50 lbs of salt dissolved in 2000 gallons of water. You pour in salt water containing 2 lbs/gal of salt at a rate of 40 gallons/minute and you keep the volume in the tank constant by simultaneously draining 40 gallons/minute. How many lbs of salt are dissolved in the tank after 25 minutes

Ican interpret and represent the remainder in division calculations sensibly for the context (eg if we wont to know how many 40 seat buses will be needed to transport 170 students for on excursion, we divide 170 by 40 and realise buses and another smaller vehicle to that we need 4 transport 10 more students) solve the following questions. show your work! 11) the zoo had 420 butterflies that needed to be transported to a new enclosure. the boxes that the butterflies would be moved in only hold 80 butterflies in each. how many boxes would they need? 2 12) each classroom in the school can have exactly 25 students, if there are 345 students in the school how many full classrooms are there?