A Middleweight UFC fighter weighs between 170 lbs and 185 lbs.

[math_celebrity]

A Middleweight UFC fighter weighs between 170 lbs and 185 lbs.

Let w be the UFC fighter's weight:

We have a compound inequality.

Right side includes 185 lbs. because between means includes 185lbs.
Left side includes 170 lbs. because between means includes 17lb0s

170 <= w <= 185