There are 84 students in two classes, A and B. There are 57 students in Class A (5/8) and Class B (3/4). How many people are there in Class B?
甲乙两个班一共有84人，甲班人数的(5/8)与乙班人数的(3/4)共有57人．求乙班有多少人？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(5/8) * 84</gadget>
<output>105/2 = around 52.5</output>

<gadget id="calculator">57 - (105/2)</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(9/2) / (1/8)</gadget>
<output>36</output>

<result>36</result>