A construction worker is building a wall the wall is 15.5 yd long. He needs to place a stud every 18 inches the first stud has already been placed at one end of the wall. How many additional studs are needed if the last stud will be placed at the other end of the wall
First, we need to convert the length of the wall from yards to inches. 15.5 yards is equal to 15.5 * 3 * 12 = <<15.5*3*12=558>>558 inches.
We then need to find out how many spaces of 18 inches are there in the length of the wall, excluding the space where the first stud was placed. 558 inches divided by 18 inches equals 558/18 = <<558/18=31>>31.
Therefore, the number of additional studs needed is 31. Answer: \boxed{31}.