There are 84 people in two classes, A and B. The number of people in class A (5/8) and the number of people in class B (3/4) are 58 people. What is the number of people in class A?
甲、乙两个班共有84人，甲班人数的(5/8)与乙班人数的(3/4)共58人，则甲班多少人．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 84</gadget>
<output>63</output>

<gadget id="calculator">63 - 58</gadget>
<output>5</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(3/4) - (5/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 / (1/8)</gadget>
<output>40</output>

<result>40</result>