The ratio of the numbers A and B is 4:5, the number B minus the number A is 6, what is the number B?
甲、乙两数的比是4：5，乙数减甲数得6，乙数是多少？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>