Elementary Geometry for College Students (6th Edition)

$S = 2lw + 2wh + 2lh$ By replacing the letters with their values (l=6,w=4,h5) We have: $S = 2\times 6\times 4 + 2\times 4\times 5 + 2\times 6\times 5 = 48 + 40 + 60 = 148$