Logical Reasoning??

Question

a) Dick is 3 times as old as his brother, Ben. In eight years' time, the sum of their ages will be 28 years. How old is each one now?
b) I have 2 sisters. The product of their ages is 72. The sum of their ages is 18. How old are my 2 sisters?
c) Greg is 18 years old, 3 times as old as his sister, Janice. In how many years' time will Janice be half as old as Greg now?

Answer 1

a. Let B=Ben, Dick=3B. So, 3B+B+16=28
b. 12 and 6.
c. If greg is 3x janice' age, she is 6. To be half gregs age now(18), she will be 9. So.......