Question

Dhoni is now two fifth of his older brother’s age and two years from now he will be half of his older brother’s age.

Two years ago, dhoni was only one-fourth the age of his older brother age at that time.
How old is dhoni now ?

Answer 1

We can set up the following equations.
Let x = Dhoni´s age and y = oler brother´s age
(1 ) x = 2/5 * y
(2) x + 2 = 1/2 ( y + 2)
(3) x - 2 = 1/4 ( y - 2)
Solving the system of equations (1) and (2) yields x = 4 and y = 10
By replacing these values into equation (3)
4 - 2 = 1/4 (10-2) Then, x = 4 and y = 10 are valid numbers

Then, Dhoni´s age equals 4

Answer 2

now dhoni is 4 years old,
his older bro will be 10 years old.