The sum of the two numbers of A and B is 72, the number of A is (3/5) of the number of B, what is the number of B?
甲乙两数的和72，甲数是乙数的(3/5)，乙数是多少？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">72 / (8/5)</gadget>
<output>45</output>

<result>45</result>