Question

The average age of a family of 5 members at the time of the birth of the youngest member was 25 year. If now the average age of the family is 28 years, then what is the present age of the youngest member of the family?

Answer 1

Answer:

total number of years =5×25=125

total number of years now=28×5=140

difference=15

present age =15/5=3

Answer 2

Given:

Average age of a 5 member family, during the birth of youngest member = $25$

Present average age of the family = $28$

To find:

The present age of the youngest member of the family

Formula used:

Average = Sum of observations / Number of observations

Step-by-step explanation:

Here, the average and number of observations is the given data

⇒ Sum of the age of a $5$ member family = $25$ × $5$ = $125$

⇒ Sum of the age of the family  = $28$ × $5$ = $140$

Difference between the age of families (past and present) = $140 - 125$ = $15$

The present age of the youngest member = $\frac{15}{5}$ = $3$

Answer:

The present age of the youngest member of the family = $3$ years