Divide a 140-meter-long rope into two sections, A and B, among which section A is 3/4 of section B, how many meters is section A long?
把一根140米长的绳子分成甲、乙两段，其中甲段是乙段的(3/4)，甲段长多少米．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">140 * (3/7)</gadget>
<output>60</output>

<result>60</result>