Which apects of a four-hour shopping trip can be expected to vary inversely

Which equation expression the relationship between the number of boxes b and the number of cans c and the proportion is 48

Plzzz answer both questions and i will give you 100 points

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.