10. The seller is distributing candies into gift boxes. When arranging them into boxes with a capacity of 10 candies, 6 candies are left over, and when arranging them into boxes with a capacity of 15 candies, 4 candies are missing. Find the number of candies, given that there were no fewer than 200 and no more than 250 candies.
Solution: $\begin{array}{ll}a=10 x+6=10(x+1)-4, & a+4 \vdots 10, \\ a=15 y-4, & a+4 \vdots 15,\end{array} \Rightarrow a+4 \vdots 30, a+4=180,210,240,270$.

Answer: 206, 236.

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