The school spends a certain amount of money to buy the same school uniform. You can buy 200 pieces if you only buy tops, and 600 pieces if you only buy pants. If you buy a set, how many sets can you buy?
学校用一定量的钱购同一种校服，只购上衣可购200件，只购裤子可购600件，成套购买，可购多少套？
<gadget id="calculator">1 / 200</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">1 / 600</gadget>
<output>1/600 = around 0.001667</output>

<gadget id="calculator">(1/200) + (1/600)</gadget>
<output>1/150 = around 0.006667</output>

<gadget id="calculator">1 / (1/150)</gadget>
<output>150</output>

<result>150</result>