A 10-meter-long ribbon is used to pack 4 gift boxes. Each gift box uses 5 decimeters. How many meters are left?
一条长10米的彩带，用来给4个礼盒包装，每个礼盒用5分米，还剩下多少米？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 4</gadget>
<output>2</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>