**Maths Shortcuts and Mind Tricks for Age Related Problems Part-II**

**Shared by: WWW.GovtJobsPortal.IN**

So here we are again providing you some shortcuts for solving age
related problems.

Q.) If the difference between the present age of a father and his son is 14 years & ratio of their ages after 11 years will be 4:3. Then Find the present age of the son.

Q.) If the difference between the present age of a father and his son is 14 years & ratio of their ages after 11 years will be 4:3. Then Find the present age of the son.

**Solution:**

We are Given

The difference of Present age between father and his son = 14
years.

Ratio of their ages after 11 years = 4 : 3

Shortcut Method:

To solve these types of questions, we can use the below matrix
formula:

Difference b/w given Age Ratio ⋯ Difference Age

⋮ ⋱ ⋮

‘Age Ratio’ whose age
we have to calculate ⋯ x

So
in this case, we have

Difference
b/w given Age Ratio = 1 (as given, 4-3 = 1)

Difference
Age = 14 years

We
have to find the age of the son, so we will take his Age ratio which is = 3.

Let
x be the age of the son

So we are
provided with three values & we have to find the fourth one. By
Substituting all the given three values in the above formula we get,

1 ⋯ 14

⋮ ⋱ ⋮

3 ⋯ x

By Cross
Multiply the values, we get

x= 42

This will be
the age of the son after 11 years as we have given the age ratio of father and
his son after 11 years. So to find the present age of the son we have to
subtract 11 from the above calculated age.

i.e The
present age of the son, x = ( 42 – 11 ) years.

= 31 years.

*Therefore, 31 years is the required answer.*

**Now, Try to solve the below question:**

Q) Seema is
younger than Mira by 4 years. If the ratio of their ages is 7:9 respectively
then what is the present age of the Seema?

**Solution:**

*According to the Formula, we have*
Difference b/w given Age Ratio ⋯ Difference Age

⋮ ⋱ ⋮

‘Age Ratio’ whose age
we have to calculate ⋯x

By Substituting
the given values in the above formula, we get

2 ⋯ 4

⋮ ⋱ ⋮

7 ⋯ x

By Cross
Multiply the given values in the matrix format, we get

2x= 28

i.e x= 14
years.

*Therefore, the required Age of the Seema is 14 years.*

*Thank You Friends !!*

*Keep Learning !*

*J*

great

ReplyDelete