Buy 5 sodas and get 1 free. 30 students in a class want to buy water on their autumn outing, and they only need to buy as much soda.
汽水买5送1，某班30名同学秋游路上想买水喝，只需要买多少汽水．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<result>25</result>