Simple!
-4-4-4-4-4 = -20
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(3 + 3) / .3
There are not 20 ways - there are only 12.
9 + 99/9 = 9 + 11 = 20
17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
How long is the rectangle? If the rectangle is only one tile long, then it will take 20 tiles.