Eighty percent of a number is 5 less than (3/5) of 45. What is the number? (solution by equation)
一个数的八成比45的(3/5)少5，求这个数是多少？(用方程解)
<gadget id="calculator">27 - 5</gadget>
<output>22</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">22 / (4/5)</gadget>
<output>55/2 = around 27.5</output>

<result>55/2 = around 27.5</result>