Atriangle with vertices at a(20, –30), b(10, –15), and c(5, –20) has been dilated with a center of dilation at the origin. the image of b, point b' , has the coordinates (2, –3).
what is the scale factor of the dilation?
a.) 1/10
b.) 1/5
c.) 5
d.)10

i'll mark brainliest !

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint