Wipro Company Numerical Ability Averages

A man bought 4 books for $50 each, 5 books for $60 each and 6 books for $70 each. The average cost of a book for the man is:
A. $50
B. $61.33
C. $60
D.$36
E. None of these

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Wipro Other Question
The average weight of 15 persons is increased by 2 kg when in place of a person having weight 70 kg another new person is included. The weight of the new person is:
A. 100 kg
B. 98 kg
C. 90 kg
D. 84 kg
E. None of these Two classes took the same test. One class of 20 students made an average grade of 80%, the other class of 30 students made an average grade of 70%. The average grade for all students in both classes is:
A. 75%
B. 72%
C. 74%
D. 77%
E. None of these