Averages Quiz Set 001

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Question 1

A box contains 5 marbles each having a weight of 156 grams. The box also contains 25 marbles each having a weight of 114 grams. What is the average weight of all the marbles in the box?

 A

121 grams.

 B

122 grams.

 C

120 grams.

 D

119 grams.

Soln.
Ans: a

The weighted average = ${5 × 156 + 25 × 114}/30$, which equals ${780 + 2850}/30$ = 121.


Question 2

The average number of visitors at a zoo on a Monday is 96, whereas it is 156 on other days of the week. What will be the average number of visitors in a 30-day month that begins on a Monday?

 A

146.

 B

147.

 C

145.

 D

144.

Soln.
Ans: a

The month begins on a Monday, so there will be 5 Mondays. The average = ${5 × 96 + 25 × 156}/30$, which equals ${480 + 3900}/30$ = 146.


Question 3

The sales(in rupees) of a gift shop for six consecutive days is 1254, 5016, 4230, 876, 984 and 2076. What is the overall average sale for these six days?

 A

Rs.2406.

 B

Rs.2412.

 C

Rs.2400.

 D

Rs.2418.

Soln.
Ans: a

The total sale on first six days is 1254 + 5016 + 4230 + 876 + 984 + 2076 = 14436. The average for 6 days is: 14436/6, which gives Rs. 2406.


Question 4

The average number of visitors at a zoo on a Monday is 90, whereas it is 84 on other days of the week. What will be the average number of visitors in a 30-day month that begins on a Monday?

 A

85.

 B

86.

 C

84.

 D

83.

Soln.
Ans: a

The month begins on a Monday, so there will be 5 Mondays. The average = ${5 × 90 + 25 × 84}/30$, which equals ${450 + 2100}/30$ = 85.


Question 5

There are three sections in school with 20, 40 and 40 students respectively. The average weight of a student in these sections, respectively, is 6, 2 and 4 Kg. What is the average weight of all the the students of the combined sections?

 A

$3{3/5}$.

 B

$3{61/100}$.

 C

$3{59/100}$.

 D

$3{29/50}$.

Soln.
Ans: a

The sums of the weights of all the students is 20 × 6 + 40 × 2 + 40 × 4 = 360. The required average = 360/total students = $360/{20 + 40 + 40}$ = ${18/5}$, which is same as: $3{3/5}$.


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Creative Commons License
This Blog Post/Article "Averages Quiz Set 001" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2017-06-24.

Posted by Parveen(Hoven),
Aptitude Trainer


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