John must mount a box which is 10 3/6 inches wide. He wants to leave 7 1/2 inches on each side of the box. How many inches across will John need?

Answer 1

To find how many inches John will need across, first add the inches on each side to find how much space those inches take up: 7 1/2 inches + 7 1/2 inches = 15 inches
Then subtract that number from the total width of the box to find the remaining space: 10 3/6 inches - 15 inches = 4 inches. Answer: \boxed{4}.