Beautiful alley

In the alley 4 rows of 10 trees and 5 rows of 8 trees blossomed. Six of the trees have already blossomed. How many trees still bloom in the alley?

Result

n =  74

Solution:

n=4⋅ 10+5⋅ 8−6=74n = 4 \cdot \ 10+5 \cdot \ 8-6 = 74

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