19. (6 points) In the sixth grade of a primary school, there are 152 students. From these, $\frac{1}{11}$ of the boys and 5 girls are selected to participate in a performance. The remaining number of boys and girls in the grade are exactly equal. How many boys are there in the sixth grade of the primary school? $\qquad$
19. (6 points) In the sixth grade of a primary school, there are 152 students. From these, $\frac{1}{11}$ of the boys and 5 girls are selected to participate in a performance. The remaining number of boys and girls in the grade is exactly equal. How many boys are there in the sixth grade of the primary school?

【Solution】Let the number of boys be $x$,
$$
\begin{aligned}
\left(1-\frac{1}{11}\right) x & =152-x-5, \\
\frac{10}{11} x+x & =147-x+x, \\
\frac{21}{11} x \div \frac{21}{11} & =147 \div \frac{21}{11}, \\
x & =77,
\end{aligned}
$$

Answer: There are 77 boys in the sixth grade of the primary school.
Therefore, the answer is: 77.