(2/15) of a rope is 2.8 meters shorter than 40% of the rope. How many meters is this rope?
一条绳子的(2/15)比这条绳子的40%短2.8米．这条绳子长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/5) - (2/15)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">2.8 / (4/15)</gadget>
<output>10.5</output>

<result>10.5</result>