Hints for SUM #24

Difficulty: Hard

Spoiler-safe hints for the SUM puzzle of October 11, 2026. Each hint is hidden until you open it; the answer stays hidden until you ask for it.

Hint 1

Target 1 (84): start with 15 − 3 = 12

Hint 2

Target 2 (163): start with 15 − 5 = 10

Hint 3

Target 3 (391): start with 5 − 3 = 2

The answer

Contains the answer. Open only if you are stuck.

3 · 5 · 7 · 15 · 16

  • Target 1: 8415 − 3 = 12 · 7 × 12 = 84
  • Target 2: 16315 − 5 = 10 · 16 × 10 = 160 · 3 + 160 = 163
  • Target 3: 3915 − 3 = 2 · 7 + 16 = 23 · 15 + 2 = 17 · 23 × 17 = 391

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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.