Averages 1/4

19. The average temperature of Monday, Tuesday, Wednesday and Thursday was $38^\circ $ and that of Tuesday, Wednesday, Thursday and Friday was $40^\circ $. If the temperature on Monday was $30^\circ $, the temperature of Friday was :
a. $40^\circ $
b. $39^\circ $
c. $38^\circ $
d. $30^\circ $

20. A shop keeper earned Rs.504 in 12 days. His average income for the first four days was Rs.40 a day. His average income for the remaining days is :
a. Rs.40
b. Rs.42
c. Rs.43
d. Rs.45

21. A man whose bowling average is 12.4 takes 5 wickets for 26 runs and there by decreases his average by 0.4. The number of wickets taken by him before his last match is:
a. 85
b. 78
c. 72
d. 64

22. The average of weight of three men A,B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E, whose weight is 3 kg.more than that of D, replaces A, then the average weight of B,C,D and E becomes 79 kg. The weight of A is :
a. 70 kg
b. 72 kg
c. 75 kg
d. 80 kg

23. The average age of A,B,C,D five years ago was 45 years. By including X, the present average age of all the five is 49 years. The present age of X is :
a. 64 years
b. 48 years
c. 45 years
d. 40 years

24. The average age of 24 students in a class is 10. If the teacher's age is including, the average increases by one. The age of the teacher is :
a. 25 years
b. 30 years
c. 35 years
d. 40 years

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