How long is 9/8 of a meter

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

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The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64