There are 120 classes of roses in the garden, roses are monthly flowers (5/6), and the number of classes of cannas is 85% of the number of classes of roses. How many classes are there for cannas?
花园里有月季花120课，玫瑰花是月计花的(5/6)，美人蕉的课数是玫瑰花的课数的85%，美人蕉有多少课？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">120 * (5/6) * (17/20)</gadget>
<output>85</output>

<result>85</result>