Teacher Wang bought 4 table tennis balls and a pair of table tennis bats, and paid a total of 59 yuan. It is known that the price of a pair of table tennis bats is 51 yuan. How much is each table tennis ball?
王老师买了4个乒乓球和一副乒乓球拍，一共付了59元，已知一副乒乓球拍的价钱是51元，每个乒乓球多少钱？
<gadget id="calculator">59 - 51</gadget>
<output>8</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<result>2</result>