Question

answer question 9 cbse 10 ​

Answer 1

You can do this my assuming that there are x green marbles and y black marbles,then total marbles are 11+x+y.so p(E)of green marble is equal to x/11+x+y and p(E)of black marbles is equal to y/11+x+y.now x/11+x+y=1/5,and y/11+x+y=1/4.niw solve these equations and at last add the results of these equations and 11 it will be equal to 1 and you can find out the value of x and y

Hope it helped .I am also a student of class 10 and I just gave exam bit I also could not do it.but it should be correct answer