Every day after the father gets off work, he can just rush to the school to pick up his daughter when the school is over. One day, the school ended early, and the daughter went home by herself. After walking for 10 minutes, her father came to pick her up. She took her father’s motorcycle home and arrived home 1 minute later than usual. The reason was that her father was 7 minutes late for get off work. minute.
每天父亲下班后刚好可以在学校放学时赶到学校接女儿回家．一天，学校提早放学，女儿自己回家，走10分钟后碰到父亲来接，坐父亲摩托车回家，到家时比平时迟到1分钟，原因是父亲下班迟了7分钟，那么学校提早放学多少分钟．
<gadget id="calculator">7 - 1</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<result>6</result>