I'm no quantum computing expert, but I thought one qubit could be used to simultaneously solve two solutions in one moment by being in two states at the same time. This article says one qubit represents 4 states, which is correct?

From the article:

1 qubit = 4 states

2 qubits = 8 states

4 qubits = 16 states

6 qubits = 24 states

This is clearly wrong as the author is just multiplying the qubits by four. I'm not going to lecture readers as to how to properly compute exponential growth, suffice it to say this is not it. How did that slip?