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Four 9s to make 20

Solution Step 0/0
Use four 9s to make 20.

What two arithmetic operations should be used to achieve the result?

Explanations

9 + 99/9 = 20

[After Boris A. Kordemsky. The Moscow Puzzles: 359 mathematical recreations. 1972]
Check x and /
Check + and -
Check / and +
Check - and x

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    • Puzzle Four 9s to make 20

    Puzzle Four 9s to make 20