Adding the barrels in Column 1 equals 15, So Cannonball + Cannonball + Cannonball + 1 = 5. So 3 times the Cannonballs = _4.

Since the Cannonballs = the same number, you need to figure out what number can be multiplied by 3 to give you a number that ends in a 4.

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The cannonballs = eight.

So 1+8+8+8 = 25

The 2 carries over to the next column.

2 + Light + light + light = 5

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Barrel = 5

Cannonball = 8

Light = 1

The answer is: 581