To determine how many inches across John will need, we need to subtract the space he wants to leave on each side of the box from the width of the box:
10 3/6 inches - 7 1/2 inches - 7 1/2 inches = 10 1/6 inches
Therefore, John will need approximately 10 1/6 inches across.
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 he need?
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