To build a road, A repairs the whole road (1/4), and B repairs the rest (2/3). A and B have built a total of 42 meters. How long is this road in meters?
修一条公路，甲修全路的(1/4)，乙修余下的(2/3)，甲乙二人共修了42米．这条路全长多少米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/4) * (2/3)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/4) + (1/2)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">42 / (3/4)</gadget>
<output>56</output>

<result>56</result>