The number of A is 80 (2/5), the number of B is (3/4) of A, what is the number of B?
甲数是80的(2/5)，乙数是甲数的(3/4)，乙数是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">80 * (2/5) * (3/4)</gadget>
<output>24</output>

<result>24</result>