Top 1,000+ Aptitude Averages Online Test - 2

Question: 6

The average of 10 numbers is 40.2 . Later it is found that two numbers have been wrongly added. The first is 18 greater than the actual number and the second number added is 13 instead of 33. Find the correct average.

(A) 40.1

(B) 40.2

(C) 40.3

(D) 40.4

Question: 7

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C, then the temperature of the 4th day is

(A) 25.2°C

(B) 25.4°C

(C) 25.5°C

(D) 25.6°C

Question: 8

13 chairs and 5 tables were bought for Rs. 8280. If the average cost of a table be Rs. 1227, what is the average cost of a chair?

(A) Rs. 125

(B) Rs. 135

(C) Rs. 155

(D) Rs. 165

Question: 9

The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was

(A) 10

(B) 11

(C) 12

(D) 14

Question: 10

Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of the train during the whole journey.

(A) 65.2 km/hr

(B) 67.2 km/hr

(C) 68.2 km/hr

(D) 69.2 km/hr