 <translate> 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. <yor> Kó o kọ́kọ́ ṣírò iye ajílẹ̀ tí àwọn ẹṣin náà ń mú jáde lójoojúmọ́: 5 gallon/ẹṣin * 80 ẹṣin = 400 gallon. Lẹ́yìn náà, kó o wá fi iye gálọ̀nù tí wọ́n ń lò lórí gálọ̀nù ilẹ̀ oko náà kún iye gálọ̀nù ilẹ̀ oko tó wà lórí gálọ̀nù ilẹ̀ oko náà. Lẹ́yìn náà, pín iye ajílẹ̀ tí wọ́n nílò sí iye ajílẹ̀ tí wọ́n ń mú jáde lójoojúmọ́ láti rí iye ọjọ́ tí wọ́n nílò láti kó ajílẹ̀ jọ: 8000 galọ̀nù / 400 galọ̀nù/ọjọ́ = 20 ọjọ́. Lẹ́yìn náà, kó o wá pín iye ilẹ̀ tí Janet fẹ́ fi ṣe iṣẹ́ náà sí iye ilẹ̀ tó lè fi ṣe iṣẹ́ náà lójoojúmọ́ kó o lè mọ iye ọjọ́ tó máa lò láti fi ṣe gbogbo iṣẹ́ náà: 20 acres / 4 acres / day = 5 days. Lẹ́yìn náà, kó o fi àkókò tó o lò láti kó ọ̀gẹ̀dẹ̀ náà jọ pẹ̀lú àkókò tó o lò láti tú u ká, wàá rí iye ọjọ́ tó gbà: ọjọ́ márùn-ún àti ogún ọjọ́ = ọjọ́ mẹ́ẹ̀ẹ́dọ́gbọ̀n. Ìdáhùn tó péye ni pé: 25. 