The price of a pair of table tennis rackets is 4.5 yuan, which is 0.5 yuan less than the total price of 10 table tennis balls. How much is a table tennis ball?
一副乒乓球拍的价钱是4.5元，比10个乒乓球的总价钱少0.5元，一个乒乓球多少元？
<gadget id="calculator">4.5 + 0.5</gadget>
<output>5</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>