Which Product Will Result In A Sum Of Different Of Cubes?

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

How is working backward similar to solving an equation?