The two ropes A and B have a total length of 20.8m. After cutting off (2/5) of A, the remaining (3/4) of A is exactly equal to (5/12) of B. How many meters is the original length of A? ?
甲、乙两根绳子共长20.8m，剪去甲绳的(2/5)后，甲绳余下的(3/4)恰好与乙绳的(5/12)相等，甲绳原来长多少米？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">20.8 * (5/12)</gadget>
<output>8.666667</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * (3/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(5/12) - (3/10)</gadget>
<output>7/60 = around 0.116667</output>

<gadget id="calculator">(3/4) + (7/60)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">8.666667 / (13/15)</gadget>
<output>10</output>

<result>10</result>