First. The product of the two numbers in B is 480. If you add 3 to A, the product becomes 720. What is the B number?
甲．乙两个数的乘积是480．如果把甲数加上3，那么乘积就变成720．乙数是多少？
<gadget id="calculator">720 - 480</gadget>
<output>240</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<result>80</result>