Xiao Ming walks to school, walks to the shopping mall exactly the full length (1/2), and walks another 50 meters to walk the full length (2/3). How many meters is Xiao Ming's home from the school?
小明步行上学，走到商场正好是全长的(1/2)，再走50米就走了全长的(2/3)．小明的家离学校有多少米？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">50 / (1/6)</gadget>
<output>300</output>

<result>300</result>