Hints for SUM #13

Difficulty: Hard

Spoiler-safe hints for the SUM puzzle of September 30, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (47): start with 5 × 8 = 40

Hint 2

Target 2 (105): start with 5 × 8 = 40

Hint 3

Target 3 (379): start with 5 + 7 = 12

The answer

Contains the answer. Open only if you are stuck.

5 · 7 · 8 · 17 · 25

  • Target 1: 475 × 8 = 40 · 7 + 40 = 47
  • Target 2: 1055 × 8 = 40 · 40 − 25 = 15 · 7 × 15 = 105
  • Target 3: 3795 + 7 = 12 · 8 + 25 = 33 · 12 × 33 = 396 · 396 − 17 = 379

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SUM

Five numbers, four operations, three targets. Combine the numbers with + − × ÷ to hit each target exactly. The same puzzle for everyone, in every language.