The ratio of the numbers A and B is 5:4, and the number B is __________ less than the number A. How many
甲、乙两数的比是5：4，乙数比甲数少__________．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>