The ratio of number A to number B is 5:4, number A is 200, what is the number B.
甲数和乙数的比是5：4，甲数是200，乙数是多少．
<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<result>160</result>