SOLUTION: The ages of A and B are in the ratio 5:3. After 6 years, their will be in the ratio 7:5. Then the present age of A is

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Question 774524: The ages of A and B are in the ratio 5:3. After 6 years, their will be in the ratio 7:5. Then the present age of A is
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The ages of A and B are in the ratio 5:3.
Let x = the multiplier, then
5x = A's age
and
3x = B's age
:
After 6 years, their will be in the ratio 7:5.
%285x%2B6%29%2F%283x%2B6%29 = 7%2F5
cross multiply
5(5x+6) = 7(3x+6)
25x + 30 = 21x + 42
25x - 21x = 42 - 30
4x = 12
x = 12/4
x = 3 is the multiplier
:
Then the present age of A is: 5*3 = 15 yrs