The number of identical towers must be a factor of both 48 and 40

The greatest common divisor of 48 and 40 is 8

48 = 8×6
40 = 8×5

So the greatest number of towers is 8.
Each tower will have 6 yellow blocks and 5 green blocks


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∎   ∎   ∎   ∎   ∎   ∎   ∎   ∎
∎   ∎   ∎   ∎   ∎   ∎   ∎   ∎
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Edwin
 

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