The position of how many letters will remain unchanged if each of the letters…

Write the original word and map its positions:

Position: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Original: N, I, G, H, T, M, A, R, E, S

Sort the letters alphabetically:

Alphabetical: A, E, G, H, I, M, N, R, S, T

Compare the original positions with the sorted positions:

Pos 1: N vs A (No match)

Pos 2: I vs E (No match)

Pos 3: G vs G (Match)

Pos 4: H vs H (Match)

Pos 5: T vs I (No match)

Pos 6: M vs M (Match)

Pos 7: A vs N (No match)

Pos 8: R vs R (Match)

Pos 9: E vs S (No match)

Pos 10: S vs T (No match)

Comparing these, the letters at positions 3 (G), 4 (H), 6 (M), and 8 (R) remain in their original spots.