First Naukri Averages Quiz -1

The total age of all family members = 30 × 14 = 420

New baby born and after 4 years the total age of all the members = 420 + 15 × 4

= 420 + 60 = 480

\frac{480}{15}=32years

Solution:

According to the question,

20 × 30 + m × 35 + (m + 4) × 25 = 29.6 × (20 + m + m + 4)

600 + 35m + 25m + 100 = 29.6 × (24 + 2m)

700 + 60m = 710.4 + 59.2m

710.4 – 700 = 60m – 59.2m

10.4 = 0.8m

m = 13 

Quantity of whiskey that is bought at Rs 25 per litre = 13 + 4 = 17 litres

Solution:

Let total no. of pens = x 

Total price = x × 95       ..... (i)

again, as per the question

Total price = 15 × 525 + (x – 15) × 85         ..... (ii)

From (i) & (ii)

⇒ x × 95 = 15 × 525 + (x – 15) × 85

⇒ 95x – 85x = 7875 – 1275

⇒ 10x = 6600

⇒ x = 660

Explanation:

We have to determine the average weight of 

M, N, O, Q,  and S

But this can't be determined as we  don't know the weight of S.

Hence the data is inadequate to solve the given question.

Explanation:

Let the average of 12 innings be a

 

Then after 13 innings, \frac{12a+96}{13}=a+5

⇒ 12a + 96  =  13a + 65

⇒ a = 31

⇒His new average after 13 innings = 31+5 = 36

Total height of jumps = 35 × 160 = 5600 cm

When actual height of models is calculated, we get = 5600 – (144 – 104) = 5600 – 40 = 5560 cm

Total actual height = 5560

Average height = \frac{5560}{35}=158.66

 

Explanation:

Total sales = Rs. 38000.

The total sales from 20 stores = 20 × 400 = Rs. 8000.

The total sales from 10 stores = 10 × 900 = Rs. 9000

The total sales of the remaining 30 stores = Rs. (38000 – 8000 – 9000) = Rs. 21000

Average Sales = \frac{21000}{30}=700

Explanation:

Let number = a;

Sum of 5 consecutive odd numbers = a + (a+2) + (a+4) + (a+6) + (a+8) 

Reqd avg = (5a+20)/5 = a+4

Let the number of students in section A is x and B is y, then

74=\frac{77.5\times x+70\times y}{x+y}

⇒ 74x + 74y = 77.5x + 70y

⇒ 4y = 3.5x

⇒  x : y = 8 : 7.

As per the given information, we get 

Average of 12 months = 3400. So, total income of all 12 months = 3400 × 12 = ₹ 40800 crore     (eq. 1)

Average of first 8 months = 3160. So, total income of first 8 months = 3160 × 8 = ₹ 25280 crore          (eq. 2) 

Average of last 5 months = 4120. So, total total of first 5 months = 4120 × 5 = ₹ 20,600 crore         (eq. 3)

Industry's income in the eighth month = (25280 + 20600) – 40800 = 45880 – 40800 = ₹ 5080 crore