The number of students in class A of the sixth grade is 9/10 of the number of students in class B. If 3 students are transferred from class B to class A, the number of people in the two classes will be equal. How many people are there in class A?
六年级甲班人数是乙班人数的(9/10)，若从乙班调3人到甲班，则两班人数相等，甲班原有多少人？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">10 + 9</gadget>
<output>19</output>

<gadget id="calculator">9 / 19</gadget>
<output>9/19 = around 0.473684</output>

<gadget id="calculator">(1/2) - (9/19)</gadget>
<output>1/38 = around 0.026316</output>

<gadget id="calculator">3 / (1/38)</gadget>
<output>114</output>

<gadget id="calculator">114 * (9/19)</gadget>
<output>54</output>

<result>54</result>