A) Puppies to Kittens.
This is because if you divide 15 and 12 by the lowest, you get 5:2 (=:
Y = 2x + 0.5
or
y = 2x + 1/2
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Multiply by the reciprocal by 3 and divide the common denominator by 14
The diameter is about 1,275.4 because D=C/pi so 4007\pi=1275.4