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 ?
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so x = 2y/5;
x+2 = (y+2)/2 => 2x +4 = 2+y => 2x – 5x/2 = -2 => x/2 = 2 => x = 4
x-2 = (y-2)/4 => 4x – 8 = y-2 => 4x – 5x/2 = 6 => 3x/2 = 6 => x = 4
and y = 10
so dhoni is 4years old now.
What happened to the missing ten dollars?