In a big box, there are marbles in 4 colors. Inside, there are 20 red marbles.  There are three times more green marbles than red.  Yellow marbles make up 20% of the green marbles. How many marbles are of a different color if the total of all marbles in the box is three times more than the number of green marbles?
There are 3 * 20 = 
<gadget id="calculator">3*20</gadget>
<output>60</output>
60 green marbles.
There are 60 * 20/100 = 
<gadget id="calculator">60*20/100</gadget>
<output>12</output>
12 yellow marbles.
In total there are 3 * 60 = 
<gadget id="calculator">3*60</gadget>
<output>180</output>
180 marbles.
That leaves 180 - 20 - 60 - 12 = 
<gadget id="calculator">180-20-60-12</gadget>
<output>88</output>
88 marbles of another color in the box.

<result>88</result>