Question

The average weight of 12 boys is 25 kg.The average weight of 7 boys is 20kg.What is the average weight of remaining 5 boys?

Answer 1

Given :

Avg. weight of 12 boys = 25 Kg

Avg. weight of 7 boys  = 20 kg

To Find :

The average weight of remaining 5 boys

Solution :

Average weight of 12 boys = 25 Kg

Total weight of 12 boys = 25 × 12 = 300 Kg

Avg. weight of 7 boys  = 20 kg

Total weight of 7 boys = 20 × 7 = 140 Kg

Total weight of remaining five boys = (300 - 140) = 160 Kg

So,

     Average weight of remaining five boys = $\frac{160}{5}$

                                                                         = 32 Kg

∴ Average weight of remaining five boys is 32 Kg.

Answer 2

The average weight of remaining 5 boys is 32 kg.

Given:

• The average weight of 12 boys is 25 kg.
• The average weight of 7 boys is 20kg.

To find: What is the average weight of remaining 5 boys?

Solution:

We know that average of n numbers are given by

$Average = \frac{sum \: of \: all \: observation}{total \: no \: of \:observation }$

Step 1:Find total weight of 12 boys.

Total boys:12

Average weight of 12 boys:25 kg

Put these values in the formula

$25 = \frac{sum \: of \: weight \: of \: 12 \: boys}{12}$

$sum \: of \: weight \: of \: 12 \: boys = 12 \times 25$

$sum \: of \: weight \: of \: 12 \: boys = 300 \: kg$

Step 2: Find total weight of 7 boys.

Total boys:7

Average weight of 7 boys:20 kg

According to the step 1,

Total weight of 7 boys is 7×20= 140 kg

Step 3: Find total weight of 5 boys.

Total weight of remaining 5 boys is =300-140 kg

= 160 kg

Step 4: Find average weight of 5 boys.

No. of boys= 5

Total weight of 5 boys = 160 kg

$\bf Average \: weight = \frac{160}{5}$

Average weight=32 kg

Thus,

Average weight of remaining 5 boys is 32 kg.

Learn more:

1) Mean of 20 observations is 15.5. Later it was found that 24 was misread as 42. Find the correct mean.

https://brainly.in/question/13575596

2) The mean of x-2a,x-a,x,x+a,x+2a is

https://brainly.in/question/48463680