6. (10 points) A store has two types of toys, Big White and Little Yellow, totaling 60. It is known that the price ratio of Big White to Little Yellow is 6:5 (both prices are whole number yuan). After selling all of them, a total of 2016 yuan was earned. How many Big Whites are there $\qquad$?
【Solution】Solution: According to the problem, using the extreme method:
If all are 6 yuan and 5 yuan, then the maximum is 360 yuan, which is not enough for 2016. Expanding by 5 times, if it is 30 yuan and 25 yuan, the maximum is 1800 yuan, which is still not enough for 2016; if it is 36 yuan and 30 yuan, the maximum is exactly 2160 yuan, which meets the requirement; let the number of Da Bai be $x$, and the number of Xiao Huang be $60-x$.
$$
36 x+30(60-x)=2016
$$

Solving for $x=36$
Therefore, the answer is: 36