The total number of ounces contained by all the big bottles is the number of big bottles multiplied by the the number of ounces a big bottle can contain.(57×40)
The total number of ounces contained by all the small bottles is the number of small bottles multiplied by the the number of ounces a small bottle can contain.(38×20)
To find n, you add the two operations, (57×40) and (38×20). So the equation would be
Since they have 57 40-ounce water bottles, you need to have 57x40. Since they have 38 20-ounce bottles in stock, you need to have 38x20. Sinc ehte problem is asking for the total ounces in all, you need to add them. We do not need to add parentheses because PEMDAS
