In what way?
19% of 49 million voters = 9.3 million (R voters)
14% of 49 million voters = 6.9 million (D voters, Trump won)
11% of 49 million voters = 5.4 million (I voters)
21.6 million (total voters)
Ds, Rs and I’s are approximately equal at 1/3 of all voters so 49 million voters in each group. I added Trumps 74 million and Biden’s 73 million to get a total of 147 million voters and divided that by 3 to get the size of each group (49 million).
Simple …. Do the additions