Hints for SUM #15

Difficulty: Medium

Spoiler-safe hints for the SUM puzzle of October 2, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (65): start with 7 − 2 = 5

Hint 2

Target 2 (251): start with 2 + 7 = 9

Hint 3

Target 3 (215): start with 2 × 7 = 14

The answer

Contains the answer. Open only if you are stuck.

1 · 2 · 7 · 13 · 20

  • Target 1: 657 − 2 = 5 · 13 × 5 = 65
  • Target 2: 2512 + 7 = 9 · 13 × 20 = 260 · 260 − 9 = 251
  • Target 3: 2152 × 7 = 14 · 1 + 14 = 15 · 13 × 15 = 195 · 20 + 195 = 215

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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.