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Form 21 n Times II (Posted on 2016-08-11) Difficulty: 2 of 5
The array below represents a set of 16 playing cards, with the A's representing Aces:

A 5 5 A 5 2 4 10 3 8 7 4 A A 2 6

Divide the array into sections of adjacent cards so that the sum of the cards' values in each section will be 21. Each Ace can represent either 1 or 11 and you must determine how many sections are needed.


From Page-a-Day Calendar 2016: Amazing Mind Benders, by Puzzability (Mike Shenk, Amy Goldstein and Robert Leighton), Workman Publishing, NY; puzzle for August 6,7.

See The Solution Submitted by Charlie    
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Solution Full solution - SPOILER | Comment 1 of 5

A 5 5* A'

5 2* 4" 10' 

 3* 8 7" 4" 
A*
A 2 6"


Non-aces add up to 61, 4 aces chip in  44 , so we get 105.

Solved in no time.

Edited on August 11, 2016, 8:31 am
  Posted by Ady TZIDON on 2016-08-11 08:29:55

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