The price of a volleyball is 21 yuan, which is 3 yuan less than the price (1/3) of a football. How much is a football?
一个排球的价钱是21元，比一个足球价钱的(1/3)少3元．一个足球多少元？
<gadget id="calculator">21 + 3</gadget>
<output>24</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">24 / (1/3)</gadget>
<output>72</output>

<result>72</result>