The number A is 35, which is 5 less than twice the number B, what is the number B? (solution by equation)
甲数是35，比乙数的2倍少5，乙数是多少？(用方程解)
<gadget id="calculator">35 + 5</gadget>
<output>40</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>