Mrs brown gets her class of 21 children to stand in a circle. she chooses the child in the first position to give one of 21 valentine’s cards anti-clockwise to the person next to their neighbour. the children keep passing the cards in this pattern until they all have one. the child at which position is last to receive a card?

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.