Verified Answer :

If c=4 and d=5 then it would be 5:4
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Answer:  The answer is d : c = 5 : 4.

Step-by-step explanation:  We are given the following values of c and d :

\(c=4,~~~d=5.\)

We are to find d : c.

We know that

a : b means the division of a to b in the simplest form, where the numerator and denominator do not have any common factor.

So, for the given variables c and d, we get

\(d:c\\\\\dfrac{d}{c}\\\\\\=\dfrac{5}{4}\\\\=5:4.\)

Thus, d : c = 5 : 4.