(1/8-112) ÷ 2 =1/48 (please check the draft every day)
1/8- 1/48=5/48 (please check 5/48 of the total manuscript every day)
1/4-5/48=7/48 (Deng is required to review 7/48 of the total manuscript every day)
1÷ (1/48+5/48+7/48) = 48/13 (the number of days for three teachers to take the entrance exam)
You got it? The second method can also be understood in this way.
1/4+1/6+1/8 = 13/24 (you want three teachers to review for two days, * * * will give it to13/24 for review, because1. So together, everyone worked for two days. )
13/24÷2= 13/48 (find the proportion of one-day trial)
1÷13/48 = 48/13 (answer)