It is: 1.75
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The number halfway between 18 and 60 is (18 + 60)/2 = 39.
17. A 4x4 rectangle has a perimeter of 16 units and an area of 16 square units. A 3x6 rectangle has a perimeter of 18 units and an area of 18 square units. The number 17 is halfway between 16 and 18.
(13 + 23)/2 = 18
The single number directly between those two numbers is 18.
It is 13.5 which is the value halfway between the two middle values 12 and 15.