When I was 24, my brother was 1/3 my age. My sister is 3 times half my brothers age. How old will my brother be when my sister is 40? How old will I be?
When this person was 24, then his brother was 1/3 of his age means, his age was 24×1/3=8 years.
His sister is 3 times half ( 3×1/2=3/2=1.5 times) of brother's age means sister age 8 × 1.5=12 years
Now the sister has turned to 40, means number of years elapsed
40–12 = 28 years
These elapsed years will also be counted for this person's brother age as well as this person's age.
Therefore brother age
Brother earlier age + number of years elapsed
8 + 28 = 36 years
And this person present age is
24 + 28 = 52 years
Answer this person brother's age presently is 36 years, while this person himself is 52 years old now.