A, B, and C are three numbers. The number of A is (3/4) of the number of B, the number of C is (1/4) of the number of A, the number of B is 120, what is the number of C.
甲、乙、丙三个数，甲数是乙数的(3/4)，丙数是甲数的(1/4)，乙数是120，丙数是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">90 * (1/4)</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>