The present age of three persons are in the proportion of 4:7:9. Eight years ago, the sum of their ages was 56 years. The present age of the eldest person is -
ক
28
খ
36
গ
45
ঘ
None of these
সঠিক উত্তর: 36
Let their present ages be 4x, 7 x and 9x years respectively.