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

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