B is twice as efficient as A and C is 50% more efficient than B. B and C together can complete a work in 10 days. How much time will be taken by A and B to complete the work, if they work on alternate days starting with A?
days
In a CAT paper, A has attempted 80% of questions with 50% accuracy and B has attempted 60% of questions with 80% accuracy. The negative marking is 25% for wrong answer, there is no negative marks for non attempted questions. What is the difference in marks of A and B?
(A) 10
(B) 15
(C) 20
(D) 30
(E) Cannot be determined