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Practice Problems [Quiz] – Average

Q.1:

A batsman in his 17th innings makes a score of 85 and thereby increases his average by 3. What is his average after the 17th innings?

A) 34 B) 35
C) 36 D) 37
Answer & Explanation
Q.2:

The average of the first 10 natural numbers is?

A) 5 B) 5.5
C) 6 D) 6.5
Answer & Explanation
Q.3:

The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?

A) 9 B) 12
C) 15 D) 18
Answer & Explanation
Q.4:

The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

A) 6 B) 7
C) 8 D) 9
Answer & Explanation
Q.5:

A team of eight entered for a shooting competition. The best marks man scored 85 points. If he had scored 92 points, the average scores for. The team would have been 84. How many points altogether did the team score?

A) 625 B) 632
C) 656 D) 665
Answer & Explanation
Q.6:

A batsman makes a score of 64 runs in the 16th innings and thus increased his average by 3. Find his average after the 16th inning?

A) 17 B) 18
C) 19 D) 20
Answer & Explanation
Q.7:

The average of 10 numbers is 23. If each number is increased by 4, what will the new average be?

A) 23 B) 25
C) 27 D) 29
Answer & Explanation
Q.8:

Find the average of the series : 312, 162, 132, 142 and 122?

A) 162 B) 174
C) 186 D) 198
Answer & Explanation
Q.9:

In the first 10 overs of a cricket game, the run rate was only 3.2. What should be the run rate in the remaining 40 overs to reach the target of 282 runs?

A) 5.75 B) 6.25
C) 6.75 D) 7.25
Answer & Explanation
Q.10:

The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person? r

A) 75 kg B) 80 kgs
C) 85 kgs D) Data inadequate
Answer & Explanation
Q.1:

The average weight of 3 person P, Q, R is 84 kg. Another person who is S joins the group and now the present average of the group becomes 80 kg. If another person T, whose weight is 3 kg more than that of S, replaces P then the average weight of Q, R, S, and T becomes 78 kg. Find the weight of P.

A) 70 kg B) 72 kg
C) 79 kg D) 78 kg
Answer & Explanation
Q.2:

The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years, what was the average age of the family at the birth of the youngest member?

A) 15 B) 12
C) 18 D) 21
Answer & Explanation
Q.3:

Sanjay earns an average of 4200 euros for the first eleven months of the year. If he wants to maintain the monthly average for the year to be 5000 euros, then what is the amount he needs to earn in the last month to achieve the required average for the whole year?

A) 14,600 B) 12,800
C) 5,800 D) 13,800
Answer & Explanation
Q.4:

The average temperature of 1st, 2nd, and 3rd November was 24.4° C. The average temperature for the first two days was 24° C. The temperature on the 3rd of November will be ?

A) 20° C B) 25° C
C) 25.2° C D) None of these
Answer & Explanation
Q.5:

The bus goes to Mumbai from Delhi at the rate of 60 km per hour. Another bus leaves from Mumbai to Delhi at the same time as the first bus at the rate of 70 km/hr. Find the average speed of the journeys of the two buses combined if it is known that the distance from Mumbai to Delhi is 420 kilometers.

A) 64.615 kmph B) 64.5 kmph
C) 63.823 kmph D) 64.82 kmph
Answer & Explanation
Q.6:

Average marks obtained by Raju in 3 papers is 52 and in the fourth paper, he scored 60 marks. Find the new average of marks scored by Raju ?

A) 55 B) 54
C) 52 D) 53.5
Answer & Explanation
Q.7:

The average temperature on Monday, Tuesday, and Wednesday was 41° C and on Tuesday and Wednesday and Thursday it was 40° C. If on Thursday it was exactly 39° C, then on Monday, the temperature was ?

A) 42° C B) 46° C
C) 23° C D) 26° C
Answer & Explanation
Q.8:

A ship sails out into the sea at the rate of 15 km/hr and sails back at the rate of 20 km/hr. What will be the average rate of sailing?

A) 17.14 km B) 16.85 km
C) 18 km D) 17.85
Answer & Explanation
Q.9:

The average of 50 members is 38. If the two numbers, 45 and 55 are discarded the average of the remaining numbers will become

A) 36 B) 36.5
C) 37 D)37.5
Answer & Explanation
Q.10:

If we choose four numbers, the average of the first three will be 16 and that of last three is 15. If the last number is 18, the first number will be ?

A) 20 B) 21
C) 23 D) 25
Answer & Explanation
Q.1:

A grocer has a sale of Rs 6435, Rs. 6927, Rs. 6855, Rs. 7230 and Rs. 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Rs, 6500 ?

A) 4991 B) 5467
C) 5987 D) 6453
Answer & Explanation
Q.2:

The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?

A) 0 B) -1
C) 1 D) none of these
Answer & Explanation
Q.3:

The average of 7 consecutive numbers is 20. The largest of these numbers is :

A) 21 B) 22
C) 23 D) 24
Answer & Explanation
Q.4:

A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?

A) 6 B) 7
C) 8 D) 9
Answer & Explanation
Q.5:

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years, The ratio of the number of boys to the number of girls in the class is :

A) 1 : 2 B) 2 : 3
C) 3 : 4 D) 4 : 5
Answer & Explanation
Q.6:

The average weight of 45 passengers in a bus is 52 kg. 5 of them whose average weight is 48 kg leave the bus and other 5 passengers whose average weight is 54 kg join the bus at the same stop. What is the new average weight of the bus?

A) 54.21 kgs B) 51.07 kgs
C) 52.66 kgs D) 53.45 kgs
Answer & Explanation
Q.7:

Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop?

A) 15 minutes B) 20 minutes
C) 18 minutes D) 22 minutes
Answer & Explanation
Q.8:

The average age of 36 students in a group is 14 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?

A) 35 years B)45 years
C) 51 years D) 54 years
Answer & Explanation
Q.9:

Third proportion of 10 and 20 is

A) 30 B) 40
C) 25 D) 20
Answer & Explanation
Q.10:

A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning?

A) 38 B) 39
C) 36 D) 32

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