• A + D = B
  • B + D = C
  • C + D = E

Solve

  • A + B = C
  • B + E = A
  • B + C = D

Solve

  • B + E = D + 5
  • C + D = E + 2
  • B + C = E + 3

Solve

  • B + C = A + 4
  • B + D = A + 1

Solve

  • E = C + 3
  • E = A + 4
  • B = A + 2

Solve

  • E = A + 4
  • C = A + 1
  • D = C + 1

Solve

  • B = 4D
  • 2D = A
  • 3A = 2E

Solve

  • 4D = 2A
  • E = 3C

Solve

  • 3E = C
  • 2D = B

Solve

  • 4A = 3D
  • 4B = 2D
  • D = 4C

Solve

  • D + E = A + B
  • C + D = A + E
  • A ≠ 5
  • A ≠ 1
  • B + E = A + C
  • A ≠ 4

Solve

  • C + E = A + B
  • C + D = B + E
  • E ≠ 2
  • A ≠ 5
  • E ≠ 4

Solve

  • 2B = A + C
  • D > B
  • 2E = C + D

Solve

  • 2E = B + D
  • 2C = D + E
  • A > E

Solve

  • A + E ≤ 4
  • C + E = A
  • A + C = D

Solve

  • D + E = B
  • B + D = A
  • A + E ≤ 6
  • C + E = A

Solve

  • B + C + D = 8
  • C + E = 3
  • B + C = 5

Solve

  • A + D = 5
  • B + D = 8
  • B + C = 9

Solve

  • if C > 1 then A > 3
  • if B + E ≤ 3 then A + D ≤ 6
  • if A ≥ 1 then E ≥ 2
  • if A + E ≤ 9 then B + D ≤ 4
  • if B + D ≤ 3 then A + E ≤ 6
  • if D + E ≤ 5 then B ≥ 4
  • if C ≠ 1 then B + E ≤ 6
  • if C + D ≤ 5 then B + E ≤ 5

Solve

  • if B + E ≤ 9 then C + D ≤ 3
  • if D + E ≤ 6 then A + B ≤ 7
  • if A + C ≤ 5 then D + E ≤ 3

Solve

  • C ≥ 1 if and only if B + D ≤ 3
  • C < 2 if and only if D > 1
  • D + E ≤ 3 if and only if B + C ≤ 5
  • A < 4 if and only if B + D ≤ 4
  • B + D ≤ 6 if and only if E ≠ 5

Solve

  • A + B ≤ 7 if and only if C < 1
  • A + C ≤ 7 if and only if D + E ≤ 8
  • A + E ≤ 7 if and only if C + D ≤ 4
  • E > 2 if and only if C ≥ 2
  • E ≤ 4 if and only if C + D ≤ 3
  • A + D ≤ 4 if and only if B + E ≤ 4

Solve

  • D + E = A
  • 2E = B
  • 2B = A

Solve

  • D = BB
  • AD = D
  • E > 3

Solve

  • AD + B + CD = C + E
  • A > BD

Solve

  • C = A + B
  • D = A + C
  • B + E = AC + D

Solve

  • C = A + E
  • E = B + 2
  • if BE + 3E ≠ B then AA + D > E

Solve

  • A = CC
  • C + D = 5
  • B + C = D

Solve

More games

Logic Grid Puzzles
Logic Grid Puzzles

Complete the grid by using logic and the given clues of each problem.

Self-Referential Quiz
Self-Referential Quiz

Quizzes where you only need logic to solve them.

IQ Tests
IQ Tests

Solve our exclusive IQ Tests and get your result for free.

Zebra Puzzles
Zebra Puzzles

Use logic deductions to solve problems that are similar to the Einstein's Riddle.