Variable Vault – Level 1 – Medium

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Home » Variable Vault – Level 1 – Medium

Four lettered dials (A, B, C, D) unlock a vault. Each dial must be set to the correct number based on the clues below. Solve all clues to find the code: the 4-digit number ABCD.

Crack the vault code using these clues:

– A + C + D = 9

– C + A + D + B = 10

– A = 2D

– A + B = C + D + 0

– B + A = 5

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Additional instructions for Variable Vault (Level 1, Medium)

Variable Vault – Medium

Algebra discipline: one clean step per line.

Expand fully before collecting like terms.
Move terms carefully across the equals sign.
Divide at the very end when the variable stands alone.

Tip: quick substitution checks save you from vault “lock failures”.

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