Correction for the size of a Baseball
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How big is 15 pinches?
It's about one-twenty-fifth as big as a Baseball
The size of a Baseball is about 341.45326620 pinches.
(MLB rules)
Per Major League Baseball rules, a baseball must measure between about 327.4279580 pinches and 355.47857430 pinches. A major league pitcher can throw a baseball at up to 150 kph (91 mph) in a fastball pitch.