Answer
One pack of strings is $14.
Work Step by Step
The equation for this word problem is $2x+16+2x=72$
Group like terms: $2x+2x+16=72$
Add similar elements: $4x+16=72$
Subtract 16 from both sides: $4x+16-16=72-16$
Simplify: $4x=56$
Divide: $\frac{4x}{4}$=$\frac{56}{4}$
Simplify: $x=14$
