Hints for SUM #12

Difficulty: Medium

Spoiler-safe hints for the SUM puzzle of September 29, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (27): start with 5 + 7 = 12

Hint 2

Target 2 (247): start with 1 + 7 = 8

Hint 3

Target 3 (273): start with 5 × 7 = 35

The answer

Contains the answer. Open only if you are stuck.

1 · 5 · 7 · 15 · 17

  • Target 1: 275 + 7 = 12 · 15 + 12 = 27
  • Target 2: 2471 + 7 = 8 · 15 × 17 = 255 · 255 − 8 = 247
  • Target 3: 2735 × 7 = 35 · 15 − 1 = 14 · 17 × 14 = 238 · 35 + 238 = 273

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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.