The sum of the numbers A and B is 150, the number A is 20 more than the number B, what is the number B?
甲乙两数的和是150，甲数比乙数多20，乙数是多少．
<gadget id="calculator">150 - 20</gadget>
<output>130</output>

<gadget id="calculator">130 / 2</gadget>
<output>65</output>

<result>65</result>