Answer:
210
Step-by-step explanation:
A jar on a shelf has 300 jelly beans.
Three-tenths of the jellybeans is blue.
That means the number of blue jelly beans is [tex]300 \times \frac{3}{10} =90[/tex]
Now, four-tenths of the jelly beans are green.
That means the number of green jelly beans is [tex]300 \times \frac{4}{10} =120[/tex]
Therefore, the number of jelly beans which are either green or blue is (120 + 90) = 210. (Answer)