At a restaurant the ratio of kids meals sold to adults meal was 5: 4. if there were 20 kids meals sold, what is the combined amount of kids and adults sold meals sold?

Pls i’m too dumb to know what i’m doing right now

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.

Opposite angles in a parrellelogram are