In a certain code language, each letter is assigned a unique digit. Based on the given codes for specific words, determine the code for the target word using the same logic. If MOUSE is coded as 45291 and RAT as 786, how is STORE coded?

Correct — A. Read each letter's digit off the two given codes.

Rule: one fixed digit per letter, kept in word order.

MOUSE = 45291: M = 4, O = 5, U = 2, S = 9, E = 1.
RAT = 786: R = 7, A = 8, T = 6.

STORE: S = 9, T = 6, O = 5, R = 7, E = 1.
That gives 96571, option (a).

Why the others are wrong

• (b)
  97653 — Starts right with S = 9, then puts 7 second. 7 is R's digit; T is 6, so the second digit must be 6.
• (c)
  98345 — 8 is A's digit, and STORE has no A. The code also uses 3, which no letter in MOUSE or RAT carries.
• (d)
  96278 — S = 9 and T = 6 are right, but 2 is U's digit. O is 5, so the third digit must be 5, and the code must end in 1 for E.

In a letter-digit substitution, each letter keeps one digit wherever it appears, and the code follows the word's letter order. Build a small table from the given words, then read the target word off it.

STORE needs S, T, O, R and E. MOUSE supplies S, O and E; RAT supplies R and T. Every letter is covered, so nothing has to be guessed.

Key facts

• MOUSE = 45291 gives M 4, O 5, U 2, S 9, E 1.
• RAT = 786 gives R 7, A 8, T 6.
• STORE = 96571.

Common traps

• Giving T the first digit of RAT's code, 7, which starts the answer 97 as in option (b).
• Stopping after two digits: options (a) and (d) both begin 96.

No directly related past PYQ was found.