<human>:  A forester is planting trees. The forest already has 30 native trees. On Monday he triples the number of total trees in the forest by planting new trees. On Tuesday, he plants a third of the amount he planted on Monday. How many trees has the forester planted in total?
<bot>: Define a variable ** Let M be the number of trees he plants on Monday.
How many trees were there on Monday? ** On Monday the forest was three times larger from the trees that were originally there and the M trees: 3*30 = 30 + M trees.
Write an equation ** So, 90=30+M.
How many trees did the forester plant on Monday? ** And, M = <<60=60>>60 trees.
How many trees did the forester plant on Tuesday? ** On Tuesday, he planted 60 trees / 3 = <<60/3=20>>20 trees.
How many trees has the forester planted in total? ** In total, he has planted 60 trees + 20 trees = <<60+20=80>>80 trees.
#### 80