2、The average height of boys in Class 5(1) is $149 \mathrm{~cm}$, and the average height of girls is $144 \mathrm{~cm}$. The average height of the whole class is $147 \mathrm{~cm}$. Then, how many times is the number of boys in Class 5(1) compared to the number of girls?
The number of boys is 1.5 times the number of girls.
Method two: Let the number of boys be $\mathrm{x}$, and the number of girls be $\mathrm{y}$, then we have the equation:
$$
149 x+144 y=147(x+y)
$$

Solving this, we get $2 x=3 y$, which means the number of boys is 1.5 times the number of girls.