If I inevitability to plant trees 5 meters apart how plentiful can i plant on one acre?

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Answers:    there are 4046.86 square meters in an acre , so if you divide this number by 2 you receive the length of two sides , 2023.43 divided by 5 meters you get 404.686 times 2 is 809.372 divided by 4 = 202.343

so you can plant 202 trees on 1 acre at the spacing you mentioned
Will cat poop ruin my vegetables?
1 acre is more or less 4047 sq meters. For every tree, you will need 5 x 5 meters = 25 sq meters. Divide your lot into 5 x 5 meter squares. If you don't need to plant your trees 5 meters from your boundaries, you may position your trees contained by the center of the squares. So 4047/25 = 161 squares = 161 trees with room to spare. If you need 5 meters between your trees and balustrade, plant the trees in the intersections of your squares (you will deduct plentifully of trees, around 42 i think). If you can plant up to your boundary, you will need more than 161 trees!