I made 4 big Chinese knots with 5.2m red thread, and I made 12 small Chinese knots with 8.16m red thread. Please raise 2 math problems and try to solve them.
我编了4个大中国结，用了5.2m红线，我编了12个小中国结，用了8.16m红线，请你提出2个数学问题，并尝试解答．
<gadget id="calculator">8.16 / 12</gadget>
<output>0.68</output>

<result>0.68</result>