can anyone check is it 1/5

Question

D4/5 (△ABC) = △A'B'C' and D1/4 (△A'B'C') = △A"B"C". What is the scale factor of the dilation between △ABC and △A"B"C"?

A. 16/5

B. 1/5

C.5/16

D.21/20

Answer 1

It is 1/5.

Since 1/4 = 5/20, the scale factor of the dilation between △ABC, △A'B'C', and △A"B"C" is 4:5:20,

so, the scale factor of the dilation between △ABC and △A"B"C" is 4:20 = 1:5.

Answer 2

You are correct