A father wants to divide 1800 rupees among his sons in the ratio of their ages. One of his sons is 12 years old while the other is 15 years old. Their respective shares would be:
Rs 800, Rs 1000
Their ratio of ages is 4:5. So, the money has to be divided in this ratio. Let the shares be 4x and 5x respectively. Now, 4x + 5x = 9x , 9x = 1800, x = 200 and hence shares would be Rs 800 and Rs 1000.