Question

A woman is 5 times as old as her daughter. In 4 years time, she will be 3 times as old as her daughter. What is the present age of the woman in years?
w = 5 d

w + 4 = 3 (d + 4)

substituting ... 5 d + 4 = 3 d + 12

solve for d , then substitute back to find w

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