A workshop. There are two workshops. The number of people in A is 75% of that in B, and B recruits several people, so the ratio of B to A is 7: 4, and then A recruits several more people.

Without conditions, it is impossible to find out how many people are in workshop B.

A: B =0.75: 1=3:4。

There are three people in A and four people in B,

(1) B plus a,

(4x+a)/3x=7/4

16x+4a=2 1x,∴a=5x/4

Now A =3x, B =4x+5x/4=2 1x/4.

(2) A plus b,

(2 1x/4)/(3x+b)=9/8

42x=27x+9b

b=5x/3。

Now A = 14x/3.

B =2 1x/4。