How many were in box A

Question

There were a total of 75 pebbels in boxes A , B and C . After moving 28 from A to B . 24 pebbels from B to C , and 19 pebbels for C to A there was and equal number in each box . How many were in box A

Answer 1

a+b+c=75

(b+28-24)=(a-28+19), so b=a-28+19-28+24=a-56+43...b=a-13

(c+24-19)=(a-28+19)  or (c+5)=(a-9), c=a-14

a+(a-13) + (a-14)=75

3a-27=75

3a=48

a=16