Answer
The wrestler played exactly 24 matches between consecutive hours.
Work Step by Step
$x_{i}$ = number of matches after $i$-th hour
We know total number of hours = 75
So 1$\leq$i$\leq$75 and 1$\leq$$x_{i}$$\leq$125.
Adding 24 to $x_{i}$ we get 25$\leq$$x_{i}$+24$\leq$149
Thus $x_{1}$,$x_{2}$...$x_{75}$,$x_{1}$+24,$x_{2}$+24..$x_{75}$+24(150integers) are between 1 and 149.
by pigeonhole principle $x_{i}$+24 = $x_{j}$where i$\ne$j
Hence proved
