**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