 
<translate> Na farko sami jimlar yawan taki da dawakai ke samarwa a kowace rana: 5 galan / doki * 80 dawakai = 400 galan. Sa'an nan kuma ninka yawan kadada na gonar gona ta yawan gallons a kowace kadada don samun yawan adadin taki da ake bukata: 400 gallons / acre * 20 acres = 8000 gallons. Sa'an nan kuma raba yawan adadin takin da ake bukata ta yawan takin da aka samar a kowace rana don samun yawan kwanakin da ake bukata don tattara takin: 8000 gallons / 400 gallons / rana = 20 days. Sannan raba adadin kadada da Janet ke bukatar rufewa da adadin kadada da za ta iya rufewa a kowace rana don gano yawan kwanakin da take ɗauka don rufe su duka: 20 kadada / 4 kadada / rana = 5 kwanaki. Sa'an nan kuma ƙara lokacin da za a tattara takin zuwa lokacin da za a shimfiɗa shi don samun jimlar lokaci: kwanaki 5 + kwanaki 20 = kwanaki 25. Amsar ƙarshe: 25. <eng> First find the total amount of fertilizer the horses produce per day: 5 gallons / horse * 80 horses = 400 gallons. Then multiply the number of acres of farmland by the number of gallons per acre to find the total amount of fertilizer needed: 400 gallons / acre * 20 acres = 8000 gallons. Then divide the total amount of fertilizer needed by the amount of fertilizer produced per day to find the number of days needed to collect fertilizer: 8000 gallons / 400 gallons / day = 20 days. Then divide the total number of acres Janet needs to cover by the number of acres she can cover per day to find how many days it takes her to cover them all: 20 acres / 4 acres / day = 5 days. Then add the time to collect the fertilizer to the time to spread it to find the total time: 5 days + 20 days = 25 days. Final answer: 25. 