【Question 7】
Teacher Li bought some fruit cakes at 4.8 yuan each and some chocolate cakes at 6.6 yuan each, spending a total of 167.4 yuan. It is known that the average price per cake is 6.2 yuan. Therefore, Teacher Li bought $\qquad$ fruit cakes and $\qquad$ chocolate cakes.
【Analysis and Solution】Average number problem.

Hence, the ratio of the number of fruit cakes to chocolate cakes is $2: 7$;
There are a total of $167.4 \div 6.2=27$ pieces;
Teacher Li bought $27 \times \frac{2}{2+7}=6$ fruit cakes, and $27 \times \frac{7}{2+7}=21$ chocolate cakes.
( Method II )
Let Teacher Li bought $x$ fruit cakes and $y$ chocolate cakes;
According to the problem, we have $\left\{\begin{array}{l}4.8 x+6.6 y=167.4 \\ 6.2(x+y)=167.4\end{array}\right.$;
Solving, we get $\left\{\begin{array}{l}x=6 \\ y=21\end{array}\right.$;
Teacher Li bought 6 fruit cakes and 21 chocolate cakes.