If the ratio of number A to number B is 5:4, which of the following statements is correct is how much less number B is than A
如果甲数与乙数的比是5﹕4，下列说法正确的是乙比甲少多少
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>