The average of the three numbers A, B, and C is 150, and A is 148. B and A are equal. What is the number of C?
甲、乙、丙三个数的平均数是150，甲148，乙与甲相等，丙数是多少？
<gadget id="calculator">150 * 3</gadget>
<output>450</output>

<gadget id="calculator">450 - 148 - 148</gadget>
<output>154</output>

<result>154</result>