Question

The probability of selecting a blue
marble at random from a jar that
contains only blue, black and green
marbles is 1/5. The probability of
selecting a black marble at random
from the same jar is 14. If the jar
contains 11 green marbles, find the
otal number of marbles in the jar.
​

Answer 1

Answer:

answer is 20...

cause 1/4+1/5 = 9/20

and 1- 9/20 = 11/20

now 11 * 20/11 = 20

i hope this is right.

if yes...

all the best....