The product of A and B is 64. If B is multiplied by 2, to keep the product unchanged, A will become 16. What is the original B?
甲乙之积为64，若乙乘2，要使积不变，甲就要变成16，原来的乙是多少．
<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<gadget id="calculator">64 / 32</gadget>
<output>2</output>

<result>2</result>