The ratio of the present age of Sandy to that of Molly is 7:2. Eight years from now, the ratio of the ages of Sandy to Molly will be 5:2. What was Sandy's age 6 years ago?
Choose one:
A) 18
B) 24
C) 30
D) 36
E) 42
Let the present age of Sandy be 7x years and that of Molly be 2x years.   (7x + 8) / (2x + 8) = 5 / 2   4x = 24   x = 6   Six years ago, Sandy's age was 7(6) - 6 = 36   The answer is 36.
<result>D</result>
The ratio of the present age of Sandy to that of Molly is 7:2. Eight years from now, the ratio of the ages of Sandy to Molly will be 5:2. What was Sandy's age 6 years ago?