A 512 page book has pages 7 inches wide by 9 inches high. The printed area measures 5.375 iches by 7.75 inches. The left margin is 0.3125 inches and the top margin is 0.5625 inches

Question

How wide are the margins at the bottom of each page? In a full decimal

Answer 1

9-0.5625-7.75 = ?

Answer 2

if top is .5625 and printed height = 7.75
then
bottom + .5625 + 7.75 = 9
bottom = 9 - 7.75 - .5625

Answer 3

Thanks @Damon