48X=(48+2)(X- 1)
X=25
25×48= 1200
2.945-(2+5)* 15=840 (1) Thinking method: 2+5+5 hours are all regarded as apprenticeship production, minus.
840/(2+5+5)=70 (pieces) The first step of production takes more than 7 hours. The remaining 840 yuan.
70*5=350 (a) apprentices are born in "12" hours, so divide by 12, which is
(70+ 15)*7=595 (pieces) is the second step. You should be able to understand the following, so don't say it.
Equation: If the apprentice does not produce X per hour, then the master produces X+ 15 per hour.
2(X+ 15)+5(X+X+ 15)= 945
X=70
5X=350,(2+5)(X+ 15)=595
3. Master-apprentice cooperation.
15-5 = 10 days
Guide the cooperation to be completed within 10 days.
12+0× 10 = 5/6.
The apprentice finished it in five days.
1-5/6 = 65438/6+0
Apprentices finish it every day.
1 ÷ 5 = 1 = 30.
Master finishes it every day.
12 1-30 1 = 20 1
If this batch of parts was completed by the master alone,
1/20 1 = 20 days