Question
The average height of a durian tree, a mango tree and a mangosteen tree is 4.2 m. The mangosteen tree is thrice as tall as the mango tree and 1.4 m taller than the durian tree. Find the average height of the durian tree and the mango tree.
2 m

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The average height of a durian tree, a mango tree and a mangosteen tree is 4.2 m. The mangosteen tree is thrice as tall as the mango tree and 1.4 m taller than the durian tree. Find the average height of the durian tree and the mango tree.