Guangming Primary School bought 6 new footballs this year, and there are 30 footballs in total. How much more this year than last year?
光明小学今年新买了6个足球，共有30个足球，今年比去年增加了多少．
<gadget id="calculator">30 - 6</gadget>
<output>24</output>

<gadget id="calculator">6 / 24</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>