The ratio of the numbers A and B is 4:5, and the number A is equal to the number B.
甲乙两数的比是4：5，甲数是乙数的多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>