Average Aptitude Set 5

21) The average weight of P, Q and R is 45 kg. If the average weight of P and Q is 40 kg and that of Q and R is 43 kg, what is the weight of Q?

1. 32
2. 65
3. 67
4. 31

Answer: D

Explanation:
Let P, Q, R represent their respective weights. Then, we have:
P + Q + R = (45 x 3) = 135…. (i)
P + Q = (40 x 2) = 80…. (ii)
Q + R = (43 x 2) = 86…. (iii)
Adding (ii) and (iii), we get: P + 2Q + R = 166…. (iv)
Subtracting (i) from (iv), we get: Q = 31.

22) The average weight of 16 students in a class is 50.25 kg, and that of the remaining 8 students is 45.15 kg. Find the average weight of all the students in the class.

1. 34.56
2. 56.23
3. 48.55
4. 31.44

Answer: C

Explanation:

23) A museum has an average of 510 visitors on Sunday and 240 on other days. Find the average number of visitors per day in a month of 30 days beginning with a Sunday.

1. 285
2. 275
3. 237
4. 245

Answer: A

Explanation:
Since, the month begins with a Sunday, so there will be 5 Sundays and 25 other days in this month.
So, the average no. of visitor per day

= 285

24) If the average marks of three classes of 45, 60 and 55 students are 60, 55, 50 respectively, find the average marks of all the students.

1. 52.85
2. 45.75
3. 64.68
4. 54.68

Answer: D

Explanation:

= (2700+3300+2750/160)
= 8750/160
= 54.68

25) In a class average age of 15 boys is 11. If 5 boys each of age 9 years are added, what would be the new average?

1. 20 years
2. 10 years
3. 10.5 years
4. 23 years

Answer: c

Explanation:
Sum of ages of 15 boys = 15*11=165
Sum of ages of 5 boys = 5*9 =45
Total age of 20 boys = 165+45 = 210
Average of ages of 20 boys = 210/20= 10.5 years

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