 
 <translate> Let's say the number of fish that was in the tank before was x. If you caught 4 fewer fish than the number that was there, then you caught x - 4. After adding x - 4 fish into the tank, the tank now had 20 fish, meaning the total number of fish in the tank is x + x - 4 = 20. 2x = 20 + 4. The total number of fish that was initially in the tank is 2x = 24. Initially, there were x = 24 / 2 fish in the tank. x = 12. If you caught 4 fewer fish than the number in my tank initially, you caught 12 - 4 = 8 fish. The answer: 8. <hau> Bari mu ce adadin kifin da ke cikin tankin a baya shi ne x. Idan ka kama kifi 4 kasa da adadin da ke wurin, to ka kama x - 4. Bayan ƙara x - 4 kifi a cikin tanki, tankin yanzu yana da kifi 20, ma'ana yawan adadin kifi a cikin tanki shine x + x - 4 = 20. 2x daidai yake da 20 + 4. Jimlar yawan kifin da ke cikin tankin da farko ita ce 2x = 24. Da farko, akwai x = 24 / 2 kifi a cikin tanki. x = 12. Idan ka kama kifi 4 kasa da adadin da ke cikin tankina da farko, ka kama kifi 12 - 4 = 8. Amsar ita ce: 8. 