It takes 365 days for the earth to go around the sun, which is 13 days more than four times the time for Mercury to go around the sun. How many days does it take for Mercury to go around the sun?
地球绕太阳一周要用365天，比水星绕太阳一周所用时间的4倍多13天，水星绕太阳一周要多少天？
<gadget id="calculator">365 - 13</gadget>
<output>352</output>

<gadget id="calculator">352 / 4</gadget>
<output>88</output>

<result>88</result>