The difference of a number m and 30 is 10

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

What is the probability of rolling a single die greater than 4

How to do this , and can some one explain