The mean score of 3 students in a test out of 25 is 18. Two new students lake the test. What is the lowest marks that can be obtained by one newcomer who scores less than the other one for the overall average of the five students to rise to 20?

Total marks of first 3 students= 18*3=54 If avg of 5 students is to be 20, the total score has to become 20*5=100 So the 2 newcomers need to score 46 together. For one to score lowest possible, other one has to score max possible marks. So the two scored 25 and 21 marks