Question

3 years ago average age of a & b was 18 years with c joining them now the average age become 22 years.how old is she

Answer 1

Concept Introduction:

In plain English, an average is one number chosen to represent a list of numbers. It is often calculated by dividing the total number of numbers in the list by the number of numbers in the list.

Solution:

Given, $3$ years ago the average age of a & b was $18$ years with c joining them now the average age becomes $22$ years.

We have to find the age of c

now, the average age of a & b $( 18 + 3) = 21$

So, the age of c is $= (22$ ×$3 ) - ( 21$ × $2 )$

$= 66 - 42$

$= 24$

Final Answer:

The final answer is $24$

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Answer 2

Answer:

2 4 is the correct answer of this question .

Step-by-step explanation:

Given : 3 years ago the average age of a & b was 1 8 years with c joining them now the average age becomes 2 2 years.

To find : how old is she

Solution :

A single number is chosen as the average to represent a group of numbers, to put it simply. By dividing the total number of numbers in the list by the total number of numbers in the list, it is frequently computed.

We have to find the age of c

now, the average age of a & b ( 1 8 + 3 ) = 2 1

So, the age of c is = ( 2 2 3 ) - ( 2 1 x 2 )

= - 6 6 - 4 2

= 2 4

Hence ,

2 4 is the correct answer of this question .

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