The school spent 360 yuan to buy volleyballs for the students. The money spent on buying footballs was 60 yuan less than twice as much as buying volleyballs, and it happened to be twice as much as buying basketballs. How much less did the school spend on buying basketballs than buying volleyballs?
学校为同学们买排球花了360元，买足球花的钱比买排球的2倍少60元，又恰好是买篮球的2倍，学校买篮球比买排球少花了多少元？
<gadget id="calculator">360 * 2</gadget>
<output>720</output>

<gadget id="calculator">720 - 60</gadget>
<output>660</output>

<gadget id="calculator">660 / 2</gadget>
<output>330</output>

<gadget id="calculator">360 - 330</gadget>
<output>30</output>

<result>30</result>