Which of the following transformations will make these two line segments concide?

a) reflection across the y-axis

b) rotation of 360 about the origin

c) translation of 3 units to the right

d) translation of 6 units to the right

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}}