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Average of P numbers is x and average of N numbers is y. Find the average of all of the numbers.

1. A (Px + Ny)/(p + N)
2. B (Px + Ny)/xy(P + N)
3. C (x + y)/(P + N)
4. D x + y

If 3a +5b = 10 and 5a + 3b = 30, what is the average (arithmetic mean) of a and b?

1. A 2.5
2. B 3.5
3. C 4
4. D 4.5

In company X, the average salary of 10 of the employees is Tk.30000, the average salary of 30 other employees is Tk.40000 and the average salary of the remaining 20 employees Tk.60000. What is the average salary of the 60 employees at the company?

1. A Tk.40000
2. B Tk.43000
3. C Tk.45000
4. D Tk.60000

When a student weighting 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?

1. A 52.2 kgs
2. B 56.8 kgs
3. C 57 kgs
4. D 58.2 kgs

If a mark of 76 or higher represents A grade, what is the nearest percentage of students who receive an A?

1. A 14%
2. B 17%
3. C 20%
4. D 9%

If the sum of (8, 5 and x) is 21, then the average of (8, 5 and x) is--

1. A 2
2. B 3.5
3. C 7
4. D 9

If the arithmetic mean of sevety five numbers is calculated, it is 35. If each number is increased by 5, then mean of new numbers is:

1. A 30
2. B 40
3. C 70
4. D 90

The average temperature on Wednesday,Thursday and Friday was 25°c. The average temperature on Thursday, Friday and Saturday was 24°c. If the temperature on saterday was 27°c, what was the temperature on Wednesday?

1. A 21°c
2. B 24°c
3. C 27°c
4. D 30°c

A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:

1. A 180
2. B 30
3. C 36
4. D 72

In a class of 22 students, 21 students get an average of 44 marks. If the remaining students get 66 marks, the average marks of the whole class is--

1. A 15
2. B 30
3. C 45
4. D None of these

The average of 10 numbers is -10. If the sum of 6 of them is 100, then what is the average of the other 4 numbers?

1. A -100
2. B -50
3. C 100
4. D 50

The average of Selim’s marks in 7 subjects is 75. His average in six subjects excluding Science is 72. How many marks did he get in Science?

1. A 72
2. B 90
3. C 93
4. D 98