The big clock strikes once at 1 o'clock, and at 7 o'clock, the big clock strikes for 42 seconds, so how many seconds will it strike until 10 o'clock.
大钟1点敲一下，7点时，大钟敲了42秒，那么到10点敲多少秒．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">7 * 9</gadget>
<output>63</output>

<result>63</result>