The average of the four numbers A, B, C, and D is 92. If A is not included, the average of the three numbers B, C, and D is 90. The number of A is (how much).
甲、乙、丙、丁四数的平均数是92，如果甲不算在内，乙、丙、丁三数的平均数是90，甲数是(多少)．
<gadget id="calculator">92 * 4</gadget>
<output>368</output>

<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">368 - 270</gadget>
<output>98</output>

<result>98</result>