Hanyuan Hotel used a sum of money to buy some dining tables and chairs. If it only bought dining tables, it could buy 30 tables and 200 chairs. How many sets of such tables and chairs can it buy with this money? (A table and chair set is composed of a dining table and 10 chairs)
汉源宾馆用一笔钱购买一些餐桌和椅子，这笔钱如果只买餐桌能买30张，只买椅子能买200把，问这笔钱能买多少套这样的桌椅？(一套桌椅是由一张餐桌和10把椅子组成的)
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">(1/200) * 10</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/30) + (1/20)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>