Xiao Ning is 9 years old this year, and her mother is 33 years old, so how many years will Xiao Ning's age be half of her mother's age.
今年小宁9岁，妈妈33岁，那么再过多少年小宁的岁数是妈妈岁数的一半．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">33 * (1/2)</gadget>
<output>33/2 = around 16.5</output>

<gadget id="calculator">(33/2) - 9</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(15/2) / (1/2)</gadget>
<output>15</output>

<result>15</result>