Question 963834
D is the correct answer.Explain. The problem says:
Father is 3 x daughter, f=3d (D) 
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Next:
10 years ago f= 7d 
This was 10 years ago. We deduct 10 from both sides because 10 years ago both f and d were 10 years younger:
f-10= 7(d-10) This is also D)