There are two ropes, A and B. A is 20 meters longer than B. Now subtract 15 meters from the two ropes. At this time, the length of rope B is 40% shorter than that of A. How many meters is the length of rope A?
甲乙两根绳子，甲比乙长20米，现在从两根绳子上各减去15米，这时乙根绳子比甲根短40%，原来甲根绳子长多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<gadget id="calculator">50 + 15</gadget>
<output>65</output>

<result>65</result>