The number of A is 0.99, the number of A is 0.9 times more than the number of B, what is the number of B?
甲数是0.99，甲数比乙数的3倍多0.9，乙数是多少？
<gadget id="calculator">0.99 - 0.9</gadget>
<output>0.09</output>

<gadget id="calculator">0.09 / 3</gadget>
<output>0.03</output>

<result>0.03</result>