Question 1151350
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In 3 years, Susan will be three times as old as {{{highlight(cross(his))}}} <U>her</U> daughter. Three years ago, the sum of their ages was 56. 
What is the daughter's age now?
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<pre>
m, Susan the mother
d, daughter


From the description, you have this system of 2 equations


    m + 3 = 3*(d+3),      (1)

    (m-3) + (d-3) = 56.   (2)


From equation (1), express  m = 3d + 6  and substitute it into equation (2). You will get


    ((3d+6) - 3) + (d-3) = 56,

    4d                   = 56

      d                  = 56/4 = 14.


<U>ANSWER</U>.  The daughter is 14 years old now.
</pre>

Solved.


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The solution and the answer by @josgarithmetic, &nbsp;giving &nbsp;28 years for the daughter, &nbsp;is &nbsp;&nbsp;<U>W R O N G</U>.


For your safety, &nbsp;ignore it &nbsp;(!)