Manny has 48 feet of wood. he wants to use all of it to create a border around a garden. the equation 2l + 2w = 48 can be used to find the length and width of the garden, where l is the length and w is the width of the garden. if manny makes the garden 15 feet long, how wide should the garden be?

a.9 feet

b.18 feet

c.30 feet

d.33 feet