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It does. One just needs to engage their brain to see it.

1) Eve says that God gave her Seth in order to replace Abel, her murdered son. Therefore, Abel's death must have been fresh in their minds for them to have considered Seth as his replacement.

2) The Bible states that Seth was born after Adam turned 130. And it's doubtful that Adam and Eve waited so long to have kids, so both Cain and Abel had been alive for nearly that long.

3) The Bible also states that Adam and Eve had many other sons AND DAUGHTERS!

So let's assume that Eve has a daughter at a not-very-brisk pace of one daughter per 10 years. That produces a grand total of 13 females in the 2nd generation. Now let's assume each of those daughters has her own daughter every 10 years, starting with her twentieth birthday. That produces 66 daughters, who form the 3rd generation.

Those 3rd generation women then go on to have their own daughters, once again starting at their 20th birthday, one per decade. They produce 165 girls for the 4th generation before Year 130.

That 4th generation, as before, then go on to produce 210 daughters for the 5th generation.

The 5th generation then produces 126 daughters before the 130th year. The 6th generation then produces 28 daughters for the 7th generation before the 130th year. And finally, the 7th generation produces 1 more daughter before the 130 years are up.

So that makes a grand total of 610 females by the time of Abel's murder. Eliminating Eve and all those under the age of 20, that leaves 376 potential wives for Cain.