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Means, and working backwards from a mean
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4-point ladder

Means, and working backwards from a mean, 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/2 solved

KA-0033

about 75s

The mean of five numbers is 12. One of the numbers is removed and the mean of the remaining four is 11. What number was removed?