A rope is (2/5) meters long, what is the total length of 10 ropes in meters?
一条绳子长(2/5)米，10条绳子共长多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<result>4</result>