The number A is 26, which is 4 less than twice the number B, what is the number B? what is the correct formula
甲数是26，比乙数的2倍少4，乙数是多少？正确的算式是多少
<gadget id="calculator">26 + 4</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<result>15</result>