The school asked Mr. Zhou to buy a batch of athletes’ clothes. If he bought a set of 320 yuan, the money Mr. Zhou brought would be 480 yuan short; if he bought a set of 280 yuan, he would bring 160 yuan more. How many sets of athlete clothing will Mr. Zhou buy this time?
学校让周老师去买一批运动员的服装，如果买320元一套的，周老师带去的钱还差480元；如果买280元一套的，则带的钱还多出160元．周老师这次要买多少套运动员服装．
<gadget id="calculator">480 + 160</gadget>
<output>640</output>

<gadget id="calculator">320 - 280</gadget>
<output>40</output>

<gadget id="calculator">640 / 40</gadget>
<output>16</output>

<result>16</result>