[Attention Surplus Disorder]

Substitute “feet” for “units”.

The blanket is 12 sq feet.

Could be 3’ x 4’, in which case 3 + 3 + 4 + 4 border = 14 feet.

Could be 6’ x 2’, in which case 6 + 6 + 2 + 2 = 16

Could be 12’ x 1’ in which case 12 + 12 + 1 + 1 = 26 feet.

Could be [sqrt] 12 x [sqrt] 12 = 3.464 x 3.464 in which case (4)(3.464) = 13.85.

Insufficient information to answer unless we assume the blanket is 3 x 4. However, The State wants you to answer 14 feet.

[Kozy]

Stupid question because we do not know the measurement of the border. Is the border 1 unit and is it one or both sides.
Core Curriculum strikes again

[US_MilitaryRules]

What about the corners? They will be missing.

[chalkfarmer]

6 x 2 is a table topper :)
12 x 1 is a table runner :)

But every sewer knows you have to allow more than that for the miter....

That is why common formative assessments should be left to the professionals ;^}

[BlueNgold]

First thing I did was assume a rectangle and digest the square roots to define the lower limit. C and D could be acieved, but not using whole units.

[Half Vast Conspiracy]

However, The State wants you to answer 14 feet.

We've got a winner!