The grandson asked the grandpa: "How old are you this year?" The grandpa said: "If I live half of my current age and add one year, then I will be 100 years old." How old is the grandpa this year.
孙子问爷爷："您今年多大岁数？"爷爷说："如果我再活我现在年龄的一半；再加上l岁，那我将是100岁了．"爷爷今年多少岁．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

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

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">99 / (3/2)</gadget>
<output>66</output>

<result>66</result>