Anna, vickie, and luanna are sisters. anna is 3 years older vickie, and luanna is 2 years younger than vickie. use v for vickie's age. write expressions to show the ages of the other two sisters.
anna's age:
luanna's age:

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}