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$21$. A bag contains black, white, gray, red, and blue marbles. Each of the $20$ students in class is asked to reach in the bag and choose a marble. The color is recorded and the marble is replaced in the bag before the next draw. The results are shown below.$\newline$\begin{tabular}{|c|c|}$\newline$\hline Marbles & Number of Draws \\$\newline$\hline Black & $4$ \\$\newline$\hline White & $7$ \\$\newline$\hline Gray & $2$ \\$\newline$\hline Red & $6$ \\$\newline$\hline Blue & $1$ \\$\newline$\hline$\newline$\end{tabular}$\newline$Based on these results, what is the best prediction of the number of black or red marbles in the bag if it contains $80$ marbles?