The sum of the numbers A, B, and C is 120, the number of A is twice the number of B, and the number of C is 20 more than the number of B. What is the number of C?
甲、乙、丙三数之和是120，甲数是乙数的2倍，丙数比乙数多20，丙数是多少？
<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<gadget id="calculator">2 + 1 + 1</gadget>
<output>4</output>

<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">25 + 20</gadget>
<output>45</output>

<result>45</result>