Answer / guest

One way to solve it is by making 3 equations and solve them
simultaneously. But there is rather easier way to solve it
using Backtracing.

It's given that at the end, each had 24 tractors (24, 24,
24) i.e. after Z gave tractors to X & Y as many as they
had. It means that after getting tractors from Z their
tractors got doubled. So before Z gave them tractors, they
had 12 tractors each and Z had 48 tractors. (12, 12, 48)

Similarly, before Y gave tractors to X & Z, they had 6 & 24
tractors respectively and Y had 42 tractors i.e. (6, 42,
24)

Again, before X gave tractors to Y & Z, they had 21 & 12
tractors respectively and X had 39 tractors i.e. (39, 21,
12)

Hence, initially X had 39 tractors, Y had 21 tractors and Z
had 12 tractors.

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