MUSIC THEORY FUNDAMENTALS - Chapter 3, Exercise 2 Solution
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Finding D Major's Relative Minor

PROBLEM
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D major has 2 sharps. Using the real relative-minor relationship from
this chapter (the sixth scale degree of the major scale), identify D
major's relative minor key.

SOLUTION
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First, build the D major scale using the W-W-H-W-W-W-H pattern (D major
has 2 sharps: F# and C#):

    D - E - F# - G - A - B - C# - D
    1   2    3   4   5   6    7   8

The sixth scale degree is the sixth note in that sequence:

    1=D, 2=E, 3=F#, 4=G, 5=A, 6=B, 7=C#

The sixth degree is B.

ANSWER: D major's relative minor is B minor.

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WHY THIS WORKS AS AN ANSWER

This directly applies Chapter 3's own stated rule: the relative minor's
tonic is always the sixth scale degree of its relative major. Both D
major and B minor share the identical key signature of 2 sharps (F# and
C#) - the same notes, just starting from a different point in the
sequence, exactly as the chapter's own C major / A minor example already
demonstrated (where A is the sixth degree of C-D-E-F-G-A).