Question

Ishika and her grandfather had their birthdays last week. The sum of their ages is 100 years. Her grandfather is 4 times her age. find their age​

Answer 1

Answer:

Age of Ishika is 20 years and age of her grandfather is 80 years.

Step-by-step explanation:

Given :

• The sum of Ishika's age and her grandfather's age = 100 years

• Her grandfather is 4 times her age.

To find :

• Find their age

Solution :

Let,

Age of Ishika = x

Her grandfather is 4 times her age.

So,

Age of her grandfather = 4x

The sum of their ages is 100 years.

★ According to the Question :

$\longrightarrow$ x + 4x = 100

$\longrightarrow$ 5x = 100

$\longrightarrow$ x = 100 / 5

$\longrightarrow$ x = 20

Age of Ishika = 20 years

_______________________

★ Value of 4x :

$\longrightarrow$ 4 × 20

$\longrightarrow$ 80

Age of her grandfather = 80 years

Therefore, age of Ishika is 20 years and age of her grandfather is 80 years.

Answer 2

Given :-

Ishika and her grandfather had their birthdays last week. The sum of their ages is 100 years

Her grandfather is 4 times her age.

To Find :-

Age

Solution :-

Let the age of Ishika be x and age of grandfather be y

Given,

Grandfather is 4 times of Ishika

y = 4x

x + y = 100

x + 4x = 100

5x = 100

x = 100/5

x = 20 years

Age of Ishika = x = 20 years

Age of Grandfather = y = 4x = 80 years