If the difference between A and B is 3.6, and the decimal point of A is moved to the left by one, it will be equal to B, then what is A?
若甲、乙两数的差是3.6，甲数的小数点向左移动一位就和乙数相等，则甲数为多少．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">3.6 / 9</gadget>
<output>0.4</output>

<gadget id="calculator">0.4 * 10</gadget>
<output>4</output>

<result>4</result>