BUY BOOKS
Variable Vault Level 1 Hard maths puzzle involving algebra, clues, codeword and dials

Variable Vault – Level 1 – Hard

Home » Puzzles » Variable Vault » Level 1 - Hard » Variable Vault – Level 1 – Hard
Topics: algebra, clues, codeword, dials, linear equations, system of equations

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:

– B + D = A
A is an even number greater than 4.
A = 2B + 2
A + C + B + D = 16
B + A = 8
A = 2(C – 1)

Your Workings For Variable Vault

Enter Code:

Reveal the Answer

Reveal Answer
Additional instructions for Variable Vault (Level 1, Hard)

Variable Vault – Hard

Sign errors are the main danger. Hard puzzles often include negatives, subtraction across brackets, or multiple variable terms.

  • Expand brackets slowly.
  • Check every sign when collecting terms.
  • Substitute back to confirm solutions.

If a result looks strange: re-check the last bracket expansion.

Full help: Variable Vault

Next Puzzle →
Concepts covered in this puzzle:

You must be logged in to view this answer.