Hints for SUM #3

Difficulty: Medium

Spoiler-safe hints for the SUM puzzle of September 20, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (61): start with 7 × 8 = 56

Hint 2

Target 2 (109): start with 7 × 17 = 119

Hint 3

Target 3 (266): start with 5 × 8 = 40

The answer

Contains the answer. Open only if you are stuck.

5 · 7 · 8 · 15 · 17

  • Target 1: 617 × 8 = 56 · 5 + 56 = 61
  • Target 2: 1097 × 17 = 119 · 5 + 119 = 124 · 124 − 15 = 109
  • Target 3: 2665 × 8 = 40 · 15 + 40 = 55 · 55 − 17 = 38 · 7 × 38 = 266

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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.