Suppose we know that there is one less person in workshop A than in workshop C. The answer is as follows:
If the number of people in Workshop B is X, then the number of people in Workshop C is 5/4x. The number of people in workshop a is y.
Equations:
5/4x -y=a
x+y-4=5/4x
You should beg for the next one
The second question is correct, and the answer is as follows:
Let the speed of armored vehicle be x km/h and the distance between a and b be y.
The equation is as follows:
6(60+x)=y
2.5x+350+2.5*60=y
Get: x=40, y=600.
(600- 150)/40+(600- 150)/60+4=22.75
That is to say, it arrives at 22: 45 p.m.