Jeremy bought postcards on a trip. he sent 5 cards to his aunt. he sent half of the remaining cards to his friends. then he sent one of the remaining cards to his sister. he was left with 4 cards. write and solve an equation to find out how many postcards jeremy bought.

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.