For a steel bar, (3/4) meters are cut off for the first time, and (4/5) meters are left. How many meters is the total length of this steel bar?
一根钢筋，第一次截去(3/4)米，还剩(4/5)米，这根钢筋的全长多少米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/4) + (4/5)</gadget>
<output>31/20 = around 1.55</output>

<result>31/20 = around 1.55</result>