The number of A is 2 less than the number of B, and the number of A is 12.2 after being reduced by 100 times. What is the number of B?
甲数比乙数少2，甲数缩小100倍后是12.2，乙数是多少．
<gadget id="calculator">12.2 * 100</gadget>
<output>1_220</output>

<gadget id="calculator">1_220 + 2</gadget>
<output>1_222</output>

<result>1_222</result>