The school bought 6 large blackboards and 24 small blackboards for a total of 642 yuan. It is known that each large blackboard is 43 yuan. How much is each small blackboard?
学校买来6块大黑板和24块小黑板，共用642元，已知每块大黑板43元，每块小黑板多少元？
<gadget id="calculator">43 * 6</gadget>
<output>258</output>

<gadget id="calculator">642 - 258</gadget>
<output>384</output>

<gadget id="calculator">384 / 24</gadget>
<output>16</output>

<result>16</result>