The average of the three numbers is 60, and their ratio is 1:4:5, how much more the largest number is than the smallest number.
三个数的平均数是60，它们的比是1：4：5，最大数比最小数多多少．
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">1 + 4 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">180 * (1/2)</gadget>
<output>90</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">180 * (1/10)</gadget>
<output>18</output>

<gadget id="calculator">90 - 18</gadget>
<output>72</output>

<result>72</result>