Which of the following Indian women cricket openers scored 320 in 45.3 overs to become the world's first pair to achieve a 300-run opening wicket partnership in a one-day internationals(ODIs)?
The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?