Data released by the Department of Education regarding the rate (percentage) of ninth-grade students that don't graduate showed that out of 50 states,


16 states had an increase in the dropout rate during the past 2 years.

​18 states had a dropout rate of at least 30% during the past 2 years.

​20 states had an increase in the dropout rate and/or a dropout rate of at least 30% during the past 2 years.


How many states had a dropout rate that was less than 30% but that had increased over the 2-year period?

Please explain. Thank you