Trees

From the total number of trees in the orchard, there are two-fifths pearls and apples are three eighty. The rest of the trees are 9 ceremonial. How many trees are in the set?

Correct result:

n =  40

Solution:


2/5n + 3/8 n + 9 = n

2/5•n + 3/8•n + 9 = n

9n = 360

n = 40

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