Think of a number in your heart, multiply it by 4, add 10, it is equal to 100, what is this number?
心里想一个数，乘4，再加上10，等于100，这个数是多少？
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">90 / 4</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>