The number of A is the number of B (2/3), the number of B is the number of C (3/4), the sum of A, B and C is 72, what is the number of B?
甲数是乙数的(2/3)，乙数是丙数的(3/4)，甲、乙、丙的和是72，乙数是多少．
<gadget id="calculator">2 + 3 + 4</gadget>
<output>9</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">72 * (1/3)</gadget>
<output>24</output>

<result>24</result>