31). On a certain day, temperatures recorded in Noida are as follows:
Time: 6 A.M. 12 A.M. 6 P.M. 12 P.M.
\( Temp \ 25 ^{\circ} C \) \( 26.5 ^{\circ} C \) \( 25.5 ^{\circ} C \) \( 23 ^{\circ} C \)
The average temperature for the day is
| A). \( 25.8 ^{\circ} C \) |
| B). \( 25 ^{\circ} C \) |
| C). \( 25.2 ^{\circ} C \) |
| D). \( 25.4 ^{\circ} C \) |
|
32). Of the three numbers, second is twice the first and is the thrice the third. If average of the three numbers is 44, then largest number is
| A). 48 |
| B). 36 |
| C). 72 |
| D). 60 |
|
33). The average age of 30 students of a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 of them is 14 years. What is the average age of the remaining students?
| A). 8 years |
| B). 10 years |
| C). 12 years |
| D). 14 years |
|
34).
Out of four numbers, the average of first three is 16 and that of the last three is 15. If last number is 18, then first number is
| A). 22 |
| B). 21 |
| C). 24 |
| D). 19 |
|
35). Deepak travels to Sohna 150 km away at an average speed of 55 km per hour and return at 45 km per hour. His average speed for the whole journey in km per hour is
| A). 52.5 |
| B). 48.5 |
| C). 49.5 |
| D). 47.5 |
|
36). The average of 5 numbers is 7. When 3 new numbers are added, the average of the eight numbers is 8.5. Average of the three new numbers is
| A). 11 |
| B). 7.75 |
| C). 8.5 |
| D). 7 |
|
37). The average age of 24 boys and the teacher is 15 years. When teacher's age is excluded, the average decreases by 1. What is the age of the teacher?
| A). 38 years |
| B). 39 years |
| C). 40 years |
| D). 36 years |
|
38). The average salary per month of 30 employees in G.K. Publishers (P) Ltd. is Rs.4000. If manager's salary is added, the average salary increases to Rs.4300, what is the salary of the manager?
| A). Rs.13500 |
| B). Rs.12500 |
| C). Rs.12300 |
| D). Rs.13300 |
|
39). The mean weight of 150 students in a certain class is 60 Kg. The mean weight of the boys from the class is 70 kg, while that of girls is 55 kg. What is the number of girls in the class?
| A). 105 |
| B). 100 |
| C). 95 |
| D). 60 |
|
40). An aeroplane flies along the four sides of a square at a speed of 100, 200, 300 and 400 km/h, respectively. What is the average speed of the plane in its flight around the square?
| A). 196 km/h |
| B). 200 km/h |
| C). 250 km/h |
| D). None of the above. |
|
