Question 57290
you can solve this question by making a simple linear equation.
let the width of the pool be x

since the length is 10 feet longer than the width, it can be stated as;
x+10
But when calculating X you must also calculate the opposing side, so simply multiply your equation by 2 to calculate in all the sides.

you must form an equation, take the length, and add to the width and multiply both by 2. 
so.

2(x+10)+2(x)=68

now you can solve for X,
first you mus expand the brackets
2X+20+2X=68
now you can combine like terms, and subtract 20 from each side.
4X=48
you divide out 4 to isolate X
x=12

the width of the pool is 12 feet and the length is 22 feet (12+10)