A father wants to divide ₹ 1800 among his sons in the ratio of their ages. If one son is 12 years old and the other is 15 years old, then their respective shares would be
₹ 800, ₹ 1000
The ratio of their ages is 12 : 15 or 4 : 5.
So, the money has to be divided in the ratio 4 : 5.
Let the shares be 4x and 5x respectively.
Now, 4x+5x=9x
Thus, 9x=1800⟹x=200
Hence, the share for the 12 year old son is
4x = 4×200 = ₹ 800
The share for the 15 year old son is
5x = 5×200 = ₹ 1000