Quantitative Aptitude

Averages

1,527 Questions

All Basic average and reverse calculation 405 Adding or removing an observation 342 Weighted and combined averages 320 Replacement and correction of a recorded value 233 Ratio shortcut for two-group mixtures 111 Equal-distance average speed 59 Age, score, weight, and spending applications 32 Consecutive terms and arithmetic progressions 25

Averages Questions

Multiple choice

There are 50 boys in a class. One boy weighing 40 kg goes away and at the same time another boys joins the class . if the average weight of the class is thus decreased by 100 g find the weight of the new boy ?

32 kg
40 kg
35 kg
37 kg

Reveal answer Fill a bubble to check yourself

Multiple choice

The average marks of $48$ students in a class is $45$. The average marks of the boys in the class is $40$ and the average marks of the girls in the class is $50$. What is the ratio between the numbers of boys and the number of girls in the class?

$2;1$
$11:1$
$1:1$
$1:2$

Reveal answer Fill a bubble to check yourself

Multiple choice

From a class of $24$ boys, a boy aged $10$ years leaves the class and in his place a new boy is admitted. As a result the average age of the class is increased by $2$ months. What is the age of the new boys ?

$6\ years$
$8\ years$
$10\ years$
$12\ years$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average of $50$ numbers is $38$. If two numbers namely $45$ and $55$ are discarded, the average of the remaining numbers is

$37.5$
$38.5$
$36.5$
$37$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average of five results is$46$ and that of the first four is $45$, fifth result is ?

$12.5$
$10$
$1$
$50$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average marks of $100$ students were found to be $40$. Later it was discovered that a score of $53$ was misread as $83$. Find the correct average corresponding to the correct score _______.

$38.7$
$39$
$39.7$
$41$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average weight of a group of 20 boys was calculated to be 89.4 kg and it was later discovered that one weight was misread as 78 kg instead of 87 kg. The correct average weight is

88.95kg
89.25kg
89.55kg
89.85kg

Reveal answer Fill a bubble to check yourself

Multiple choice

The average age of $30$ students of a class is $12$ years. The average age of a group of $5$ is $10$ years and that of another group of $5$ is $14$ years. What is the average age of the remaining students ?

$12$ years
$10$ years
$8$ years
$14$ years

Reveal answer Fill a bubble to check yourself

Multiple choice

In a school the average score of all 1400 students at an examination was found to be 69.5 The average score of boys in the school was 68 and that of girls was 72 Hence the number of boys and the number of girls respectively are

$680$ and $720$
$720$ and $680$
$875$ and $525$
$800$ and $600$

Reveal answer Fill a bubble to check yourself

Multiple choice

Average weight of $8$ boys is $57$ kgs, if weights of seven of them are $65, 43. 29, 37, 82, 50$ and $55$ kgs, then weight of the eighth student is

45 kgs
55 kgs
65 kgs
none of these

Reveal answer Fill a bubble to check yourself

Multiple choice

The average age of a class of $39$ students is $15$ years. If the age of the teacher is included, then the average increases by $3$ months. Find the age of the teacher.

$30$
$35$
$25$
$20$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average of marks of $12$ students is $15$. The marks of a student who scored zero were wrongly taken as $18$ and average was determined. The correct average marks is _________.

$15$
$14.5$
$13.5$
$12$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average of $9$ numbers is $8$. What should be added as $10^{th}$ number to make the average $9$?

$10$
$72$
$18$
$90$

Reveal answer Fill a bubble to check yourself

Multiple choice

The average age of $5$ teachers is $28$ years. If one teacher is excluded the mean gets reduced by $2$ years. The age of the excluded teacher is ___________.

$26$ years
$33$ years
$36$ years
$35$ years

Reveal answer Fill a bubble to check yourself

Multiple choice

The average weight of $3$ men A, B, and C in a group is $84$kg. Another man D joins the group and the average weight now becomes $80$kg. Another man E, whose weight is $3$ kg more than that of D, replaces A and the average weight of the group (B, C, D and

$70$ kg
$72$ kg
$75$ kg
$80$ kg

Reveal answer Fill a bubble to check yourself

← Previous
1
2
…
61
62
63
64
65
66
67
68
69
…
101
102
Next →