The present ages of three people in proportions is 3 : 5 : 7. Six years ago, the sum of their ages was 87. Find their present ages (in years).
1
24 years, 40 years, 56 years
2
18 years, 30 years, 42 years
3
21 years, 35 years, 49 years
4
27 years, 45 years, 63 years