AGE PROBLEM and RATIO: present ages of three colleagues are in proportions 3:5:7 [with 3 solutions]

The present ages of three colleagues are in proportions 3:5:7. Four years ago, the sum of their ages was 48. Find their present ages (in years)?

a.) 12,20 and 28 years
b.) 13, 15 and 23 years
c.) 11, 16 and 19 years
d.) 20, 24 and 27 years


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