Give the step-by-step reasoning process and then the final answer. Rachel is 12 years old, and her grandfather is 7 times her age. Her mother is half grandfather's age, and her father is 5 years older than her mother. How old will Rachel's father be when she is 25 years old?
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Rachel's grandfather is 12 x 7 = 84 years old. Her mother is 84 / 2 = 42 years old. Her father is 42 + 5 = 47 years old. Rachel will be 25 years old in 25 - 12 = 13 years. Rachel's father will be 47 + 13 = 60 years old.
The final answer: 60.
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