Kindergarten aunts buy milk, how many bags can you buy for 100 yuan? Promotional activity buy four get one free, 5 yuan per bag of milk.
幼儿园阿姨买牛奶，100元可以买多少袋促销活动买四送一，每袋牛奶5元．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">100 / 5 / 4</gadget>
<output>5</output>

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

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<result>25</result>