Question 1151281
.
<pre>

    x - 6 = {{{(3/4)*x}}}.


Solve for x, which is the original length.


Or notice that 6 meters is exactly {{{1/4}}} of the original length,

so the answer is  6*4 = 24 meters, without any equation/equations.




<U>Note</U>.  The words  "it became . . . "  I interpret as  "the remainder became . . . "
</pre>