 
<translate> Da farko gano yawan ruwan da yake cika wanka a awa daya: 40 ml / minti * 60 minti / awa = 2400 ml / awa. Sa'an nan kuma cire ruwan da ke tururi don samun adadin ruwan da aka kara a kowace awa: 2400 ml / hour - 200 ml / hour = 2200 ml / hour. Sa'an nan kuma ninka wannan adadin ta yawan sa'o'i don samun adadin ruwa a cikin baho: 2200 ml / hour * 9 hours = 19800 ml. Sa'an nan kuma sami adadin mililita a cikin lita 12: 12 lita * 1000 ml / lita = 12000 ml. Sa'an nan kuma cire ruwan da Jack ya cire daga yawan adadin ruwa don samun ragowar ruwa: 19800 ml - 12000 ml = 7800 ml. Saboda haka, amsar ita ce 7800. <eng> First find how much water fills the bathtub per hour: 40 ml / minute * 60 minutes / hour = 2400 ml / hour. Then subtract the water that evaporates to find the total amount of water added per hour: 2400 ml / hour - 200 ml / hour = 2200 ml / hour. Then multiply that amount by the number of hours to find the total amount of water in the tub: 2200 ml / hour * 9 hours = 19800 ml. Then find the number of milliliters in 12 liters: 12 liters * 1000 ml / liter = 12000 ml. Then subtract the water Jack removes from the total amount of water to find the remaining amount of water: 19800 ml - 12000 ml = 7800 ml.
Therefore, the answer is 7800. 