By how many cm is 1/10 m longer than 1/100 m

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22