conversations.from: human
conversations.value: 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?
conversations.from: assistant
conversations.value: There are 3 * 20 = 60 green marbles.
  There are 60 * 20/100 = 12 yellow marbles
  In total there are 3 * 60 = 180 marbles.
  That leaves 180 - 20 - 60 - 12 = 88 marbles of another color in the box.