Question

Darisa is 10 years older than Adahun. 10 years from now, Darisa would be twice as old as Adahun was 10 years ago. How old would Adahun be after 12 years.

Answer 1

Adahun's age = x

Darisa 's age = x+10

after 10 years, Adahun's age = x+10 and Darisa's age = x+10+10

According to condition after 10 years

darisa's age = 2 times Adahun's age, 10 years ago

so we reduce Adahun's age by 10 = (x-10)

x+20 = 2(x-10)

x+20 = 2x-20

x=40

So present age of Adahun=40, and after 12 years he will be 52years.

Cross check : adahun = 40, darisa= 50

after 10 years = darisa 60 and adahun s age 10 years ago from present is 40-10 = 30

according to condition = which is 2 times 30

Answer 2

Given:-

• Darisa is 10 years older than Adahun. 10 years from now
• Darisa would be twice as old as Adahun was 10 years ago.

To Find:-

• How old would Adahun be after 12 years.

Solution:-

• Adahun's age = x
• Darisa 's age = x+10

after 10 years, Adahun's age = x+10 and Darisa's age = x+10+10

According to condition after 10 years

darisa's age = 2 times Adahun's age, 10 years ago

so we reduce Adahun's age by 10 = (x-10)

x+20 = 2(x-10)

x+20 = 2x-20

x=40

So present age of Adahun = 40, and after 12 years he will be 52 years.

After 10 years = Darisa's age will be 60 and Adahun's age 10 years ago from present is 40 - 10 = 30